1. Custom Fit Vehicle Wiring
  2. Demco
  3. Universal Fit
  4. Fifth Wheel and Gooseneck Wiring
  5. 7 Blade
  6. 10 Feet Long
Demco 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug - 10' Long

Demco 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug - 10' Long

Item # DM8555002
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Our Price: $98.58
Custom Fit Vehicle Wiring

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Demco 7 Blade Custom Fit Vehicle Wiring - DM8555002
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Mount this 7-way, RV-style connector in your truck bed to simplify hookup of your 5th-wheel or gooseneck trailer. Harness plugs into existing wiring and retains use of factory 7-pole at the bumper. 90-Degree connector fits into tight spaces. Call 800-298-8924 to order Demco custom fit vehicle wiring part number DM8555002 or order online at etrailer.com. Free expert support on all Demco products. Guaranteed Lowest Price and Fastest Shipping for Demco 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug - 10' Long. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (14)
  • Q & A (98)
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Demco Custom Fit Vehicle Wiring - DM8555002

  • Universal Fit
  • Fifth Wheel and Gooseneck Wiring
  • Demco
  • 7 Blade
  • 10 Feet Long

Mount this 7-way, RV-style connector in your truck bed to simplify hookup of your 5th-wheel or gooseneck trailer. Harness plugs into existing wiring and retains use of factory 7-pole at the bumper. 90-Degree connector fits into tight spaces.


Features:

  • Provides 7-way, blade-style connector in your truck bed for hassle-free hookup of 5th-wheel or gooseneck trailer
    • Connector can be mounted in truck bed sidewall, tailgate post, or wheel well
    • 10' Long, insulated wiring harness easily reaches from rear bumper to truck bed
  • Plugs into factory wiring - no cutting or splicing
    • Requires that truck have factory tow package
    • Retains use of factory 7-pole connector at rear of truck
  • Offers enhanced weatherproofing with corrosion-resistant terminals and rubber-coated copper wiring
  • Lid with oversize hinge opens 180 degrees for easy connection
  • Constructed of extremely durable ABS plastic
  • Includes self-tapping screws and nylon ties for installation


Specs:

  • Harness length: 10'
  • 5-Year limited warranty


8555002 Demco 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug - 10'

Installation Details DM8555002 Installation instructions

This Product Fits The Following Vehicles




Video of Demco 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug - 10' Long

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




Video Transcript for Demco 5th Wheel/Gooseneck Wiring Harness Installation - 2016 Ford F-250 Super Duty

Speaker 1: Today on our 2016 Ford F-250 Super Duty, we're gonna be taking a look at and showing you how to install the Demco Fifth Wheel Gooseneck 90 degree wiring harness with seven pole plug. Part number DM8555002.This is what our seven pole wiring kit looks like when it's installed. This provides you with all the necessary lighting functions for your trailer, with your turn signals, running lights, brake lights, your grounds, your reverse lights, including brakes. This is what our wiring looks like when it's underneath the truck. You can see it has nice wiring to protect our wires, so it's gonna give you 10 foot of length to run from the bed of your truck, or wherever you decide to mount it, down to your existing seven pole plug.Typically you'd want to mount this as close to the tailgate as possible on your inside wall. Now, they have a tailgate extender, so I think he's gonna have trouble getting his cable plugged in there, so we're gonna move it up one to about right there.

So we want to make sure wherever you decide to mount it, that you look on the other side and don't drill all the way through the sidewall of your fender. Once you've got your mounting location, we're gonna drill a pilot hole. Once you've got your pilot hole drilled, you're gonna come back with a two inch hole saw bit.Next I'm gonna take a file and I'm gonna clean up my edges. Then you want to take some black paint or clear coat, and cover that bare metal up to help reduce the risk of any corrosion. Next we'll take our self taping screws that come in our kit in a quarter inch socket.

We're gonna mount our plug in place. Now that we've got that in, I'm gonna take the single side of my wiring harness, come up through the side of my bed, and I'm gonna plug it right into the back of that connection point.As you can see, I can't get my wiring harness onto the back of my plugs. What I'm gonna have to do is I'm gonna go back in the bed, I'm gonna loosen the bolts that I just put in so I can get that pulled in enough to install this. Slide this out. Once you've made the connection, you can reinstall your screws.

This is our seven pole on the back of our truck. What we need to do is I'm gonna have to pop this out of here so I can connect the other end of my wire that I just put on my bed to the back of this. There's gonna be two clamps on the back side here. So now we need to disconnect the plug here. Like that.

Pull this over, and that end's gonna connect into our plug running up to the back of our truck.Next we're gonna route our double end over to our seven way plug that was mounted on the back of the truck. You want to make sure you stay away from anything that's hot or moving so that the plug doesn't get damaged. And then one end of our plug's gonna plug in here. The other end's gonna plug into the four pole that was mounted here. Before we do that, I'm gonna add some Dielectric grease onto the connections. It'll help keep it from corroding if any moisture happens to get inside there. Push them together really quick.Next we'll take our extra wire loom and wiring. We're gonna roll it up, and we're gonna zip tie it right up here to all this existing wiring underneath the bed of the truck. Then we'll cut off our excess, clean up our install.Now using an alternate power source, we'll test our lighting. You can also just use a trailer. We'll start with our blinkers. Left blinker. Right blinker. Running lights. Brakes. That'll do it for a look at an installation on a Demco Gooseneck 90 Degree wiring harness with seven pole plug. Part number DM8555002 on our 2016 Ford F-250 Super Duty.


Customer Reviews

Demco 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug - 10' Long - DM8555002

Average Customer Rating:  4.8 out of 5 stars   (14 Customer Reviews)

Mount this 7-way, RV-style connector in your truck bed to simplify hookup of your 5th-wheel or gooseneck trailer. Harness plugs into existing wiring and retains use of factory 7-pole at the bumper. 90-Degree connector fits into tight spaces.

- DM8555002
by:

Perfect fit. Arrived to me quickly. Thanks Paula at etrailer! 793091



- DM8555002
by:
Ram 3500

Easy quick install and plenty of cable to run this to any location within the bed of your truck. i installed this in my New 2020 GMC 3500 Denali in less than 30 minutes!! Perfect fit as always from etrailer!! 775459



- DM8555002
by:

Good quality and fit 604649



- DM8555002
by:
2016 GMC Sierra 2500

directions are miss leading . 2" hole isn't big enough as another tab has been added which makes swinging the plug thru the hole impossible . I have a dremel tool at home and ground a tab area for the tab to go thru and was easy as pie then . Plug hook up easy and all was good after getting it thru the hole. 601859



- DM8555002
by:

good produst easy to install 601920



- DM8555002
by:
2017 Chevrolet Silverado 3500

Easy install 597670



- DM8555002
by:

Bonjour, très bon produit, connexion fait pour mon camion et facile à installer. 574773



- DM8555002
by:

both products were shipped well packed and undamaged very impressed with the customer service and the shipping thanks again 492404


Comments
good quality very satisfied thanks
Gregory - 04/04/2019

51443

- DM8555002
by:
2016 Ford F-250-Super-Duty

Wiring harness was easy to install and is holding up nicely a year and half later. Great product and price too from etrailer. 431775



- DM8555002
by:
2006 Chevrolet Silverado

While I had to wait for the product because of it was back ordered, the wait was not unreasonable and the etrailer staff keep me updated the whole time. The harness is high quality. Service was top notch. 365890



- DM8555002
by:
2011 GMC Sierra

Works great. 352529



- DM8555002
by:
2015 Ford F-250 Super Duty

Good product fast shipping 327905



- DM8555002
by:
2013 Ford F-250 and F-350 Super Duty

Have not yet installed, but a well built part with clear and concise installation instructions. Plug and Play! 309416


Comments
Still happy with all of it.
Charley S - 10/23/2017

29750

- DM8555002
by:

It is long enough, dose what I needed. Nice polite people to deal with. I got confuse when P.O. kept saying the cable cleared SLC P.O. and on way to me. Thank you and enjoyed doing business with you! Richard 246129


14
14

Ask the Experts about this Demco Custom Fit Vehicle Wiring

  • 7-Way Connector for Socket Under 2015 GMC Sierra 2500 for 5th Wheel Trailer Wiring
    Sounds like you have found a round connector under your 2015 GMC Sierra 2500 like the picture I attached that was designed to have a 7-way plugged in with a part # PK11893-11932.
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  • Trailer Turn Signals and Brake Lights Not Working with 2011 GMC Sierra
    Chances are the problem you're having is caused by blown fuses. There are actually two fuses that service these lights. Your truck will have a fuse for the left turn signal and left brake light and another fuse for the right turn signal and right brake light. According to the owner's manual of your 2011 GMC Sierra the fuses are fuses 1 and 3 in your engine compartment fuse box. Replacing these will likely solve your issue. However, being that your truck isn't that old it's more...
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  • Recommended 5th Wheel Hitch for a 2005 Ford F-150 5-1/2 Foot Bed
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  • Where are the Connections Under the Hood of a 2013 GMC Sierra to Complete 7-Way Wiring
    Under the hood of your truck there are a few connections that need to be made near the fuse box in order to complete the 7-way's wiring. This will allow the brake output and 12 volt accessory circuit to be complete. Check out the help article I attached to see how to do this. You will have to scroll about half way down the page to see how this is done.
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  • Does Demco 5th Wheel/Gooseneck Wiring Harness Fit 2020 Ram 2500
    So long as you have the factory 7-way, yes, the Demco 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug # DM8555002 does fit the 2020 Ram 2500. This harness plugs into the factory wiring on your Ram and will allow you to use the 7-way at the rear of your vehicle as well if you also have a bumper tow trailer. This harness even includes the mounting screws for installation. I have added a link to a video review for you to check out as well of the Demco 5th Wheel/Gooseneck...
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  • Recommended 5th Wheel Automatic Sliding Hitch for Ford Factory Prep Package Puck System
    For your 2015 Ford F-350 with 6-3/4 foot bed and SRW 4x4 there are many fits for your factory prep package. I recommend the Demco Hijacker Autoslide 5th Wheel Hitch w/ Slider - Single Jaw - Ford Super Duty Prep Package - 18K # DM8550024 which will adjust to give you turning clearance as you drive. This hitch will fit in your OEM pucks as will larger 21K # DM8550038 if you have a heavier trailer. You may also want to consider adding a second 7-way in the bed of your truck using...
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  • Best Sliding 5th Wheel Hitch for 2019 Nissan Titan XD Short Bed With Factory Gooseneck
    The best fifth wheel hitch for your 2019 Nissan Titan XD short bed with the factory gooseneck is the Demco Hijacker Autoslide because you will never again need to get out of your truck just to make a turn, making your towing experience much more convenient. It also has a highly secure jaw system which ensures a complete, secure connection to your trailer's king pin as well as its cushioned head which will give you a smoother and quieter ride while towing. The Hijacker will mount onto...
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  • How to Install the Demco 18K Hijacker Autoslide 5th Wheel Trailer Hitch on a 2011 GMC Sierra 2500
    In order to mount the Demco 18K Hijacker Autoslide 5th Wheel Trailer Hitch part # DM8550022 in the bed of your 2011 GMC Sierra 2500 you will need to use the Underbed Rail and Installation Kit for Demco Hijacker Hitches part # DM8551010. The Replacement Side Plates for Demco Hijacker Autoslide 5th Wheel Trailer Hitches part # DM6004 that you referenced is designed to allow the above bed version of the Demco 18K Hijacker Autoslide 5th Wheel Trailer Hitch part # DM8550034 to be used with...
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  • Recommended 5th Wheel Hitch for 2016 Nissan Titan XD to Tow 2018 Forest River Sabre 5th Wheel
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  • Demco Hijacker Autoslide Compatibility with 2017 Ford F-250 Factory Rail System Holes/Pucks
    For your Demco Hijacker Autoslide, if you have the above bed rail version like the 18K # DM8550034 or the 21K # DM8550035, then you will be able to use the adapter for your factory puck system. This adapter for your 2017 Ford F-250 is the Reese Elite Series Underbed Rail Adapter for Standard 5th Wheel Trailer Hitches - 20,000 lbs # RP30156. If you want the hitch that will fit without an adapter, the # DM8550038 or # DM8550024 would be the options. You may also want to consider...
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  • Hitch Extension for Camper & Replacement 2-1/2 Inch Trailer Hitch for 2006 Chevy Silverado 2500HD
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  • Do I Need a Sidewinder for a 2019 Ram 1500 with the 5-1/2 Foot Bed
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  • Compatibility of Demco Hijacker AutoSlide with GMC Factory Rail Adapter for 2018 GMC 2500 HD
    The Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 6-1/2' Bed - 21K # DM6194 is a confirmed fit for your truck and will allow you to use an autoslide hitch like # DM8550034. If you friend has the # DM8550022, then you would also need the Replacement Side Plates for Demco Hijacker Autoslide 5th Wheel Trailer Hitches - Above Bed Mount # DM6003 to make the hitch and the adapter compatible. I also recommend the Demco 5th Wheel/Gooseneck 90-Degree Wiring...
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  • Can the Demco Hijacker 8550034 be Used with an Under Bed Mount Kit on a 2019 Chevy Silverado 3500
    Absolutely, the Demco Hijacker Autoslide 5th Wheel Trailer Hitch part # DM8550034 is for above bed mounting rails. However, you can make it compatible with the underbed mounting kit for your 2019 Chevrolet Silverado 3500 which is the Underbed Rail and Installation Kit for Demco Hijacker part # DM8551010 by obtaining the Replacement Side Plates for Demco Hijacker Autoslide 5th Wheel Trailer Hitches part # DM6004. I also recommend that you purchase an in-bed 7-way like the Demco 5th Wheel/Gooseneck...
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  • How can I Adapt my Demco Autoslide Fifth wheel to my Nissan Titan XD with the Prep Package?
    We have exactly what you need! You will use the Replacement Side Plates for Demco Hijacker Autoslide 5th Wheel Trailer Hitches - Above Bed Mount part # DM6003 to connect to your autoslide then connect it to the Demco 5th Wheel Rail Adapter for Nissan Titan XD OEM 5th Wheel Towing Prep Package - 21,000 lbs part # DM6200. This combined with your autoslide will give you a great system and the auto slide will help out tremendously when doing those slow maneuvers. If you're not already...
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    The 5th wheel and Gooseneck towing capacity of a vehicle like your 2016 Nissan Titan XD Diesel 4x4 will be almost identical. A 5th wheel trailer will have more weight directly over the bed in most cases, but it is built for the weight to be dispersed between the king pin and axles in the same way that a gooseneck trailer is dispersed over the coupler and the axles. Due to that slightly higher weight on the hitch of a 5th wheel trailer, the hitch itself has a wider base over the frame...
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  • Recommendation For 5th Wheel Hitch For 2009 Chevrolet Silverado HD
    Depending on the total loaded weight of the fifth wheel you get, your 2009 Chevrolet Silverado 2500 HD should work for you. I did some research and found that GM has given the 2500 HD a maximum fifth wheel towing capacity of 16,700-lbs. What exactly are your limits will be determined by your vehicle model. Make sure to check your owner's manual for capacities and recommendations. If you have a 6-1/2 foot bed, I recommend the Demco Fifth Wheel Sliding Hitch, Item # DM8550034. You...
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  • Recommended Hijacker Autoslider with Adapter for 2017 Ram 2500 Factory Puck Rail System
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  • Recommended Best Sliding 5th Wheel Hitch For 2011 Chevy Silverado 2500 With 6-1/2 Foot Bed
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  • Recommended 5th Wheel Hitch Adapter for GMC Factory Rail Kit Puck System
    For your 2018 GMC Sierra 2500 you will need the Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 6-1/2' Bed - 21K # DM6194 to adapt your factory rail kit to your 5th wheel hitch. If you don't have a slider base on your 20K Reese hitch, you will also want the Reese Square Tube Slider for 5th Wheel Trailer Hitch - 10" Travel # RP30048 unless your trailer has a Revolution or Sidewinder Pin Box to allow you enough turning clearance. You may also want to consider...
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    The fact that you have the factory tow/prep package means that you have many options for fifth wheel towing. If you want a hitch that would drop directly into the pucks, which is the simplest application, I'd recommend the Curt Sliding Q16 fifth wheel hitch, part # C16520-16020. If you wanted to use something that's a bit less expensive, the Reese # RP30051 would work, but you'd need the # RP30156 adapter in order to install the hitch. The adapter would install into the pucks sunk into...
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  • Recommended Lube Plate For Demco Hijacker Autoslide 5th Wheel Hitch
    You can use the Curt 10" Fifth Wheel Trailer Hitch Lube Plate # 16721 with your Demco Hijacker Autoslide 5th Wheel Trailer Hitch w/ Slider - Single Jaw - Above Bed - 18,000 lbs # DM8550034. This will help with connecting your truck to your trailer. You may also be interested in the Demco 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug - 10' Long # DM8555002 to add a second 7-way wiring connection to the bed of your truck for easy access to your wiring connection.
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  • Recommended Sliding 5th Wheel Hitch for 2017 Ford F-250 Short Bed with Factory Puck System
    For your 2017 Ford F-250 6-3/4 foot bed, I recommend the Curt A16 5th Wheel Trailer Hitch w/ Slider for Ford Towing Prep Package # C16520-16020. This hitch will give you a nice sliding hitch that will have a 3 point indicator system to confirm proper coupling and will also have the adapter for the puck system in your factory rail kit. It will give you 12 inches of travel between the two locked positions for turning clearance when needed. If you want a hitch that moves automatically...
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  • 5th Wheel Hitch Installation Kit for 2003 Ford F-250
    Thank you for providing those important details about your 2003 F-250 that will soon be home to a new 5th wheel hitch. Since you have a short bed pickup you will need a slider type hitch to ensure enough turning clearance for your low-speed maneuvers. For a base rail/installation kit I suggest using a custom-fit option that reduces your overall install time and the amount of drilling needed. Since these industry-standard rails kits are not hitch-specific, you can use any brand of rail...
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  • Operation and Compatibility of Demco Autoslide 5th Wheel Hitch with Air Lift Rear Air Bag Kit
    The rack-and-pinion slider mechanism in the Demco Hijacker Autoslide 5th Wheel Trailer Hitch # DM8550022 does work in both forward and reverse directions. Once the pin box causes the hitch head to turn past about 15-degrees the autoslide mechanism engages and slides the head unit rearward for better turning clearance. In your 2016 Ford F-250 short bed without factory rail kit you can use Demco installation kit # DM8551000 and for a wiring harness part # DM8555002 which plugs right in...
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  • Comparing Demco 5th Wheel Auto Slide Hitches 21K DM8550038 and 18K DM8550024
    Demco 5th wheel hitches # DM8550038 and # DM8550024 are both confirmed fits for your 2015 Ford F-350 with the factory installed 5th wheel kit. Both are drop-in installations and both hitches include the automatic slider feature and a generous 14-inches of front-to-back travel for excellent turning clearance. The Demco hitches do include cushioning in the form of polyurethane dampeners that work to reduce noise and shocks from road surfaces. Construction of the Demco hitches is quite...
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  • Recommended 5th Wheel Hitch for 2018 Ford F-250 with 6-3/4 Foot Bed
    Yes, the 2018 Ford F250 will work fine for the 5th wheel you mentioned. I recommend going with the factory rail kit to give you a clean bed when you are not towing. I also recommend the Demco Hijacker Autoslide 5th Wheel Hitch w/ Slider - Single Jaw - Ford Super Duty Prep Package - 18K # DM8550024 which will automatically slide to give you turning clearance for your short bed truck. This particular hitch it designed specifically for your truck. If you prefer a manual slider option,...
    view full answer...
  • Parts Needed to Install Demco Hijacker Autoslide DM8550024 on 2016 Ford F250 6.5ft w/ Factory Rails
    Yes, the Demco Hihacker Autoslide # DM8550024 is the 18K 5th wheel hitch you ordered and will be compatible with your 2016 Ford F-250 6.5 foot bed with factory installed underbed rail kit. The Demco Hijacker Autoslide fifth wheel hitch # DM8550024 comes assembled from the factory to help make the installation easier and quicker. The only prep work necessary is to bolt on the side plates, which are included. You will not need any additional parts to install the Hijacker, but I did...
    view full answer...




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Info for this part was:

Video by:
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Video by:
Kathleen M
Video by:
Jonathan Y
Edited by:
Lindsey S
Expert Research:
Jameson C
Video Edited:
Jacob T
Video Edited:
Dustin K
Video Edited:
Chris R
Video Edited:
Zach D
Installed by:
Cole B
Written by:
Amanda M
Test Fit:
Shane H
Test Fit:
Robert C
Updated by:
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Updated by:
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