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Derale Transmission Line Compression Fitting Kit - 3/8" Line to 3/8" NPT Barb

Derale Transmission Line Compression Fitting Kit - 3/8" Line to 3/8" NPT Barb

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Derale Accessories and Parts - D13032
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Easily install your new transmission cooler by simply splicing in this compression fitting. Universal adapter is for lines measuring 3/8". 1-800-940-8924 to order Derale accessories and parts part number D13032 or order online at Free expert support on all Derale products. Great prices and Fastest Shipping for Derale Transmission Line Compression Fitting Kit - 3/8" Line to 3/8" NPT Barb. Accessories and Parts reviews from real customers.
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  • Reviews (18)
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Derale Accessories and Parts

  • Transmission Coolers
  • Fittings
  • 3/8 Inch NPT Hose Barb
  • Derale

Easily install your new transmission cooler by simply splicing in this compression fitting. Universal adapter is for lines measuring 3/8".


  • Makes installing transmission cooler quick and easy
  • Fits most vehicles with 3/8" transmission lines
  • Made in USA


  • Line: 3/8"
  • Fitting: 3/8" NPT hose barb
  • 1-Year warranty

13032 Derale Universal Transmission Line Fitting

Item # D13032

Video of Derale Transmission Line Compression Fitting Kit - 3/8" Line to 3/8" NPT Barb

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Transmission Cooler Installation - 2003 GMC Yukon XL

Today on our 2003 GMC Yukon XL, were going to install the Derale Performance Transmission Oil Cooler, part number D13504. Weve added a few additional parts to make it easier for us to install this kit through transmission line universal fittings, part number D13032 and additional hose to go from where we tap in to the manufacturers transmission line to our cooler, part number D13003. To start, weve already raised the vehicle up and were getting underneath of it. To give us some little working room, were going to go ahead and remove the rock guard for the total of five attachment points here for our rock guard. Next, well need to locate the vehicle transmission lines. These two lines here run from the radiator cooler to the transmission.

The upper line is considered the low side of the return side from our transmission cooler back to the transmission. This is the side that we prefer to tap into. Next, were going to take our tubing cutter to cut the steel line in half. Now, before I cut the line, Im going to go ahead and clean it. If we do it before we cut the line, it will prevent us from getting any of the dirt or cleaner into the transmission line.

Im going to spray a little brake cleaner and just take a rag to clean the line thoroughly. This could also be done with a piece of light grid sandpaper or emery cloth. Alright, now with the line cleaned, well go ahead and take our tubing cutter and the cut the line in half. It is recommended to use a tubing cutter as using a tubing cutter will give us a nice clean cut versus if we use a grinding wheel or a hacksaw that will leave a bunch of burst and can cause the line to become out of round. Now with my line cleaned, Ill go ahead and direct the transmission oil thats running out of the line into my drain pan.

Well let that go ahead and drain a little bit, and then well clean the line off again. When considering the orientation of way you cut your line, you want to make sure you have a straight enough section to get your compression fitting in and also enough working room that should be on the route of your hosing. Now, lets go ahead and install our compression fittings. Our new compression fitting kit will come in four pieces. Pieces will end up in this orientation.

With the compression piece or the crush piece gets smashed in between the double threaded nipple and a crush cap. Well go ahead and slide those on to the line first. Youll need to make sure that the center crush piece is lined up before you can slide it on the line. Then once its in position, well hold the double threaded nipple in position as we tighten down the crush cap. This will create our compression fitting on the line. Now that weve secured this crush sleeve in between the thread and threaded nipple and the crush nut, were going to go ahead and add the barb fitting. The barb fitting will fit directly into the thread and threaded nipple and then well tighten it down. Now, were ready to go ahead and move the top cover. Well just set it aside for installation later. Next, to gain more access to make it easier for our install, were going to go ahead and remove the front grill. Now with our grill off, we need to find a suitable location to mount our new cooler. Because of the size of our new cooler, not just any location will work. So what were going to do, well go ahead and remove the bottom brace, get them behind it, then well be able to take our cooler and attach it directly to the bottom brace. Once we get our cooler back in line to the brace, well go ahead and reinstall the brace. Next, what Ill do is go ahead and pre-drill a couple of small holes to the brace so that we can use self-tappers to go the bracket on the new cooler. Using my yellow marker, we can go ahead and mark the orientation on where I want to drill the hole then Ill just go ahead and move the cooler aside to make sure that we dont drill through the brace into the cooler. For added security, you can also drop in a block of wood behind where youre drilling to make sure you dont puncture the airconditioner condenser. Alright, with the drivers side done, well go ahead and move over to the passengers side. Now, lets go ahead and position our cooler so we can go ahead and install our self-tapping screws to hold it in position. Once you get it in line back up and in position, Im going to go ahead and take a pair of Vise-Grips to hold it in place. Any Vise-Grips or clamp will do. Alright, now that we have our fastener installed, well go ahead and remove our clamp and were ready to start routing our lines. Taking a utility knife, I'm just going to cut off a larger section around this already preexisting opening. This is going to give us ample room to route our hoses. Now, lets go ahead and start installing our lines. Well go ahead and take our hose and our hose clamp. I'm going to gently tighten the hose clamp onto the hose just to secure it while we get it installed. Well route our hose down underneath the. While theyre in, well go into the transmission cooler. Before installing your hose onto the cooler, I recommend to take a little of the new transmission fluid, draw and put it on the hose, and on the nipple of the cooler. It will make it easier to slide your new hose up into position. Now once I get my hose in position, Ill go ahead and loosen the hose clamp back up, move it up into position and then tighten it down. Now with the drivers side down, Ill go ahead and repeat the same process on the passengers side. Well go ahead and get underneath the vehicle, finish routing our hoses to the nipples that we preinstalled earlier. Once your route your hose to the preexisting nipple, well go ahead and cut off any excess hose that wont be needed. And again, before we try and slide it onto the nipple, well take our hose clamp. Well go ahead and clip it up onto the hose. Set it up out of our way for the time being. Put some transmission fluid on the hose and the nipple. I want to lubricate it thoroughly as it will help slide the hose onto the nipple. Once we get the hose onto the nipple. Once we get the hose onto the nipple. Well go ahead and bring our clamp back in and tighten it down. Alright, now weve got that side down, well go ahead and repeat the same process with the other side. Alright, now that weve made our connection, it completes the install portion of our transmission cooler. Lets go ahead and start it up and test for leaks. Now that weve tested for leaks, were ready to go ahead and secure our lines. I'm just going to take a couple of the black zip ties and secure the two lines together at the coupling, and then also where the two hoses meet as they go around the core support. With our zip ties installed, Ill just go ahead and take my side cutter and cut up the excess from the zip ties. Now, were ready to go ahead and reinstall everything. Now that weve completed reassembling the vehicle, lets go ahead and check the fluid level on the transmission. Well pull the transmission dipstick out and see where it seats this time. As you can see, its well below the fuel line. Lets go ahead and add some fluid and then well double check it. Now, were well within the tolerance of the transmission fluid level on the dipstick. This will complete the install of our Derale Performance Transmission Cooler part number D13504 for our 2003 GMC Yukon XL.

Customer Satisfaction Score:

Customer Reviews

Derale Transmission Line Compression Fitting Kit - 3/8" Line to 3/8" NPT Barb - D13032

Average Customer Rating:  4.4 out of 5 stars   (18 Customer Reviews)

Easily install your new transmission cooler by simply splicing in this compression fitting. Universal adapter is for lines measuring 3/8".


Ok let start by saying that I have purchased items before and the products are always quality items. This item I ordered was backordered so I knew that it would be slow coming. Ok when the item above did come in it was processed right away and I was emailed to keep me informed.(great!). The problem that I did have now came from the post office. In tracking this item for more than a week I noticed it stayed in Missouri for almost the entire week. Not etrailers
fault I guess. I will purchase again because this is a good company but I wish they would get a better mailing system and follow up with their own tracking so that if a package is taking a long time, maybe they could fix it. I was ready to cancel the order but it finally came today.
Thank you for the time to vent a little


Used this on a 2006 Silverado 2500HD 6.0L in order to install an upgraded Derale transmission cooler. These were in fact the correct size for my factory transmission lines and installation was easy as long as you can bring yourself to physically cutting your factory transmission fluid lines up front near the factory cooler. Only reason I gave 4 stars here is because there is some very very minor seepage of fluid from these connections. Transmission lines were cut squarely with a tube cutter and fully de-burred and I even re-torqued the fittings a couple of times but still some very minor seepage. No dripping at all just a bit of noticeable fluid around the connections. The Derale transmission cooler on the other hand... 5 stars all day. That thing is great.

A year later, these fittings are still doing well. No leaking and are holding up just fine.
Tyler W - 06/03/2021


Exactly what I wanted! Excellent item. My very first time using a compression fitting and it worked flawlessly. Watching the installation video helped me greatly with its purpose and use. I will absolutely order this item EVERY time I install a transmission cooler.

My connector is still working great! No leaks! Very happy with this product!
Sean - 07/20/2015


Didn't know a lot about trans coolers but with the help of your website, I ordered parts confident in knowing how to install and how they would perform.


Read reviews on the item and was skeptical about its effectiveness. Loaded it up with teflon tape on all threaded parts. Leaked after about 5 minutes of running engine. Retorqued and seems to have solved the issue so far. Only have about 3 hrs on it so far. Time will tell.


The product does not come with instructions. I installed it based on the sample installation video. They leaked on the threaded nipple end, and not just a little!

They required disassembly, wrapping threads with Teflon and reassembly. So far, no leak.


Worked perfectly on my silverado


Easy fix for GM leaking transmission li nes.


Worked good

very good!
Daniel J - 09/24/2018


Works as they should no issues


Works great on the inlet side but is not correct for the outlet side. Wish you would advertise that.


as always -- great purchase experience, timely delivery, great product. thanks!


Worked great on hooking up cooler


Quick shipping....quality product


done the job


Great product and easy to put together. Fit great.


high quality product


Easy to use


See what our Experts say about this Derale Accessories and Parts

  • How Tight Should Compression Fitting # D13032 Be when Installing a Transmission Cooler
    Generally, you will tighten the fittings as much as you can with normal hand tools. If you then do a test after installation by starting the vehicle, check for leaks at the fittings. If you notice even a a drop of fluid leaking out then you will need to tighten them down further. Heat can make the metal expand so checking for leaks is important. in the video I have linked you will see our installer using regular wrenches to tighten down the hardware. Notice that he is making the fittings...
    view full answer...
  • How Many Fitting Come with Derale Compression Fitting # D13032
    The compression fitting part # D13032 comes with everything you see in the picture I attached. Basically it's enough to to one fluid line.
    view full answer...
    Image 1 for
  • Does Derale Transmission Cooler Install Require Teflon Tape
    I would not recommend using Teflon tape with Derale transmission cooler installs or with compression fittings like part # D13032. They aren't needed if the fittings are tightened down properly and if for some reason if the tape was to break off and get into the transmission fluid it might negatively affect the transmission.
    view full answer...
  • Recommended Fittings To Install Remote Transmission Filter Kit On 2005 Ford F-150 With 5.4L Motor
    I called my contact at Derale and asked about the transmission lines you said you have on your F-150. They said they do not have any fittings that would be nearly an inch in size as you described. They told me that if the lines you have are 3/8 inch, and if the Insta-dapt Adapter included with the # D13090 will not work then you would need to cut the line and use a compression fitting like part # D13032. You could use two of these and splice into the line coming from the transmission...
    view full answer...
    Image 1 for
  • Transmission Cooler Installation Tips for a 2007 Toyota Tacoma
    Orientation of the inlet and outlet ports does not matter, and it does not matter which line goes where. Your best bet is to figure out the best mounting situation for the easiest connection to your vehicles transmission fluid return line. If you can mount the cooler with the inlet and outlet ports up you will get slightly better cooling performance, but testing has shown that there is only a difference of 2 or 3 degrees from any other position. Transmission coolers are straight flow through...
    view full answer...
    Image 1 for
  • Compression Fitting Recommendation for 1999 Honda Accord Transmission Cooler
    Since you have 3/8 inch transmission lines the correct adapter you need is the part # D13032 which is a compression fitting for that size line that you can use to install a transmission cooler like the part # D13502 on your 1999 Honda Accord.
    view full answer...
  • How to Install a Transmission Cooler on a 2016 Honda Pilot with the 9 Speed Transmission
    I spoke to my contact at Derale and although they have not had a chance to physically test their transmission coolers on the 9 speed transmission in your 2016 Honda Pilot yet, I do believe we have an option for you that will allow you to install the cooler. What you are going to want to do is install the Derale Transmission Line Compression Fitting Kit part # D13031 for 5/16" to 3/8" or part # D13032 for 3/8" to 3/8". The compression fitting side will need to be attached to the smooth steel...
    view full answer...
  • Transmission Cooler Recommend For a 2002 Ford F-250 XLT Super Duty 6.8L V10
    When installing a transmission cooler, it is always a good idea to install the largest cooler that will fit in the space available on your truck. Transmission fluid cannot be over-cooled, however, if you live in a typically cold climate, it is a good idea to let your vehicle run for 10 minutes before taking off. For your 2002 Ford F-250 XLT Super Duty, going with the Derale Series 8000 Plate-Fin Cooler, # D13504, that you referenced would my recommendation. It is recommended to install...
    view full answer...
  • Will Derale # D13503 Transmission Cooler Work on 2007 a Toyota Highlander w/ 3.3L Engine
    The Derale # D13503 transmission cooler isn't a vehicle specific item, so it would work just fine on your Highlander. The transmission cooler would install directly behind the grille, in front of the AC condenser and radiator, for maximum airflow. The cooler would tap into the transmission return line from the radiator to the transmission, the fitting you need will depend on the diameter of the transmission line. For a 5/16 diameter line, use the # D13031 fitting or the # D13032 for a 3/8...
    view full answer...
  • Recommended Transmission Cooler for 2013 Kia Sportage Towing 1500 lb Travel Trailer
    A transmission cooler is not a vehicle specific item. For best results, we recommend installing the transmission cooler directly behind the vehicle grille, directly in front of the radiator and A/C condenser. We recommend going with the largest cooler that will fit in the available space. If you have enough room to accommodate its 8-3/4x11 inch size, the # D13503 cooler would work very well for you. If your Sportage has 5/16 inch transmission lines, I'd also recommend using two of the #...
    view full answer...
  • Fittings for a Transmission Cooler for a 2016 Volvo V60 Polestar
    Since we haven't had the chance to install a transmission cooler on a 2016 Volvo V60 Polestar yet I am not sure what kind of fitting that your transmission cooler uses. What you can do to ensure that it fits a transmission cooler is cut the fitting off of your hose, measure your hose diameter, and then choose a compression fitting that matches the diameter of your hose. We have one for a 3/8" Line # D13032, a 5/16" Line # D13031, and a 1/2" Line # D13033. You can then filter through our...
    view full answer...
  • Recommended Transmission Cooler For 2019 RAV4
    The Derale Series 8000 Plate-Fin Transmission Cooler Kit w/Barb Inlets - Class II - Efficient # D13501 is the most popular universal-fit transmission cooler for various vehicles and should fit your 2019 Toyota RAV4. This cooler measure 11" wide, 5-3/4" tall, and 7/8" deep. To confirm if this will work on your vehicle for sure you will need to measure the space between your grille and radiator and compare to the cooler's dimensions. This transmission cooler works with 5/16" lines. If your...
    view full answer...
  • Aftermarket Accessories for 1985 BMW 735i
    The aftermarket accessory items we offer for a 1985 BMW 7 Series, like wiring kits, roof racks and bike carriers appear on the linked page. We also have catalytic converters such as MagnaFlow # MF23559. I'm sorry but we don't carry vehicle OEM parts such as a specific screw or other fittings for a BMW 4HP22 transmission. These are likely to found most easily at a local dealership.
    view full answer...
  • How to Tap into Transmission Fluid Return Line on a 2012 Ford Expedition for a Transmission Cooler
    The line that you will need to tap into is the transmission fluid return line. The easiest way to determine the return line on your 2012 Ford Expedition transmission is to start the truck, shift into drive but do not go anywhere. After about 15 seconds or so put the truck back in park and apply the emergency brake. Turn off the truck. Out of the 2 hoses attached to the transmission, one should be warmer than the other. The one that is cooler is the return line. You can use radiator adapter...
    view full answer...
  • Suitability of Derale Transmission Cooler, Part # D13503, for 2010 Toyota Rav4 Limited V6
    Transmission coolers are not vehicle-specific, so you are free to select any one that will fit into the available space in front of your air conditioning condenser. In the world of coolers bigger is better. The particular Derale cooler you reviewed, the Derale Series 8000 Plate-Fin Class III, part # D13503, is a substantial unit that measures 11 x 8-3/4 x 7/8 inches. This will do an excellent job of cooling your Rav4 transmission. It includes the Derale Insta-Dapt radiator adapter that...
    view full answer...
  • Is a Transmission Cooler Required for a 1992 Dodge B250 V8 for Towing a 1500 lb Tent Trailer
    Adding a transmission cooler is never a bad idea. Anytime you are towing a trailer, the engine and transmission have to work harder. Keeping your transmission fluid at a lower temperature will prolong the life of your transmission. One factor that you can look at to determine if a supplemental transmission cooler would be absolutely necessary is the towing capacity of your 1992 Dodge B250. If the weight of your tent trailer is near the towing capacity of your van, I would strongly recommend...
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  • Transmission Cooler for 2003 Toyota Tundra with 4.7L Engine
    Transmission coolers are not vehicle specific items, so the idea is to choose the largest, most efficient cooler that will fit in the space available. The best and most efficient place to mount a transmission cooler is directly behind the grille in front of the radiator and A/C condenser. If the space available will accommodate its 11 x 11-3/8 inch dimensions, the Derale # D13614 would be an excellent choice. The fittings needed will depend on the diameter of your transmission lines. For...
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  • Transmission Line Fitting Recommendation for 1984 Chevrolet Silverado 454 Turbo
    The Derale Radiator Adapter Fittings, # D13018, covers 1987 - 2007 Chevy trucks so I can not guaranty that this would work for you. Instead you can use a universal fitting like part # D13031 for 5/16 inch line, # D13032 for 3/8 inch line, or # D13033 for 1/2 inch line. You will just need to take a quick measurement of the line on your 1984 Chevrolet Silverado 454 Turbo to determine which one you will need.
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  • Is a Transmission Cooler Recommended for a 2007 Toyota Sienna Towing a 1,500 lb Camper
    Adding a transmission cooler would be a good idea, especially if you will be towing during the summer. Overheating is one of the main causes of transmission failure and towing a trailer puts more stress on the engine and transmission. Transmission fluid cannot be over cooled, so it is best to install the largest and most efficient cooler that will fit. A cooler that I would recommend for your 2007 Toyota Sienna is the Derale Series 9000 Plate-Fin Transmission Cooler, # D13612. This cooler...
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  • Transmission Cooler Recommendations for a 2011 Toyota Corolla
    Both the Derale Series 9000 Plate-Fin Transmission Cooler Kit, # D13611 and the Derale Series 8000 Plate-Fin Transmission Cooler Kit , # D13501, would be a great choice for your 2011 Toyota Corolla. The general rule is that transmission fluid cannot be cooled too much, so using the largest cooler that will fit is a good idea, especially if towing. The only reason not to add the largest cooler possible, would be if you live in very cold climates where temperatures are below 0 degrees often...
    view full answer...
  • Transmission Cooler Recommendation for a 2006 Chrysler Pacifica
    A transmission cooler is always a good idea if you are towing. Overheating is one of the biggest causes for transmission failure because your transmission relies on the transmission fluid to stay cool. The added stress from towing a trailer on the engine and transmission will cause the transmission fluid to heat up more than normal. It is a good idea to get the largest transmission cooler possible because transmission fluid cannot be cooled too much, however, you will be limited by the...
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  • Recommended Compression Fittings For Dodge Durango 2011 Citadel 5.7L Transmission Cooler
    The insta-dapt comes with all of the Derale kits. It is unfortunately not always a fit as it is a universal adapter. You have a couple options, you can flare the lines you have or I recommend using compression fittings. To ensure you choose the correct compression fitting for your vehicle, you will want to measure the diameter of your transmission lines. The most common size is 3/8 inches, but it would be safe to measure first. I have attached links to the compression fittings that we...
    view full answer...
  • Recommended Transmission Line Adapter for Derale Plate-Fin Cooler on a 2007 Dodge Ram Turbo Diesel
    I spoke to my Derale contact and he informed me that if your vehicles current lines are steel or aluminum you will need a compression fitting adapter like # D13033 for the # D13502 Plate-Fin Transmission Cooler. You would need to find out what size line you have and choose the corresponding adapter. 1/2 inch line uses the # D13033. For 3/8 inch line you will want the # D13032 and for 5/16 inch line you will need the # D13031. The cost will be listed with each product. I have linked...
    view full answer...
  • Is the Derale Insta-Dapt Radiator Adapter Part # D13004 Needed on a 2000 Volvo S70
    The Derale Series 8000 Plate-Fin Transmission Cooler Kit w/Barb Inlets part # D13501 comes with everything you will need for installation including the Derale Insta-Dapt Radiator Adapter part # D13004 unless your radiator does not accept 1/2”-20 female fittings then you would want to use the Derale Transmission Line Compression Fitting Kit part # D13031 for 5/16" factory transmission lines or part # D13032 for 3/8" factory transmission lines. Unfortunately, there is no real way for me...
    view full answer...

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