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Dealing with awkward angles while flushing tanks is no longer a hassle. The Flush King Reverse Flush Valve features a 360-degree swiveling handle that lets you clean at any height or plumbing bend, making operation smooth and straightforward. Its quick bayonet fittings ensure swift setup without tools, saving you time and effort.
No more second-guessing if your RV's holding tanks are truly clean. Thanks to the clear barrel on the Flush King, you can visually confirm when your tanks are clean. This transparency, combined with thorough rinsing, helps maintain accurate monitor readings and prevents pesky false signals.
Clogs in the plumbing lines can be frustrating, but with the Flush King's dual-mode water direction, you can break them up easily. The "Tank" mode backflushes your black-water and gray-water tanks, while the "Hose" option rinses your sewer hose right at the source, ensuring clear conduits and peace of mind.
Worried about potential contamination? The Flush King has got you covered with its built-in backflow preventer, keeping your water source clean and safe from contaminants during the flushing process, so you can rest easy while tackling dirty jobs.
Setting up your flush system should be as easy as hooking up a standard 3" sewer pipe. With its bayonet fitting on one side and a lug fitting on the other, the Flush King Reverse Flush Valve fits seamlessly onto your RV's waste valve, allowing you to connect effortlessly without the need for additional tools.
California residents: click here
Even though I have a black tank flush port, this adapter allow better water flow into the tank for flushing, and of course use on the gray tanks that don’t have flush ports.
This valve is a must have to help keep your tanks clean! We are FT and it is a normal part of our set up. Works a well after a year of use.
Purchased this after seeing the water flow in the Camco version was significantly less. This has great flow to reverse flushing your tanks.
Who decides on size of box for shipping and do you train them on securing product for shipment? I ordered two wiper blades, two heater door clips, sewer flush king and sewer cap. They were shipped in a huge box (21"x26"). So big that the flush king came out of its packaging from being tossed around inside the box. I'm sure everything was bounced around the entire trip to my door cause there was only one small strip of filler for cushion and the box was crushed onretailer. It could have been shipped in a box half that size. I'm actually not expecting my flush king to stay together long. Disappointed in the shipping package. I guess you take your chances. I never expected this from etrailer.
VERY impressed with product, my first time "back-flushing" the black-tank & was impressed with the amount of dried toilet paper flushed! A+++
Every RV / Camper owner needs this on their tank hook up.
Great use on grey water tank.
I purchased the Flush King device to solve a problem I had with Black Water Valve not closing all the way. I suspected some type of debris was causing the gate valve to not seat correctly. The Flush King device allowed me to back flush the line near the source of the problem and the dump valve is now working great. Every RV owner should have access to the a Flush King device to keep your dump tanks free and unobstructed.
I also purchased a wand so I can flush the Black Water Tank from above. This is a great tool for cleaning sensors and pipe between toilet and tank.
Works great for our fifth wheel that didn’t come with a factory installed black tank flush system. Use this every time we are done camping and the smells are gone and tank sensors read as they should. Well worth the money!
I have not had opportunity to use the unit yet, but did take it out of box and installed unit. The picture on web site makes it look like the valve gate would be against the exisiting pipe, but it is just the opposite. When installed on my Terra Oasis, it sticks out past the trailer tire, so I don't think I would want to leave it on while traveling.
Katrina B.
8/12/2022
I would definitely agree with your review. We do not recommend permanently mounting this item. We have heard of some people doing this but to get the best, longest-lasting use out of this we highly recommend only using it when needed as opposed to keeping it on when you are traveling.
The best trailer accessory ever. It is working great after a year. No leaks. Versatile. Rotates to accommodate the various geometries of the curbs at dump stations. Two back flushes usually gets everything cleaned out of the black tank. The clear pipe shows it is working perfect! If this ever breaks I will buy the exact one again.
I had one of these and just loved the way it worked and helped me be sure my holding tanks were clean and empty. Unfortunately, on our recent trip something apparently came up off the road and made it disappear as well as breaking a fitting on the line coming from the trailer. I've gotten so used to using this that I really hated to dump without it.
We buy quite a bit of things from Etrailer for our business equipment and my RV. Always get good service.
Wow this thing works! I not only cleared a black tank stoppage that prohibited the black tank frm draining at all, I cleaned both the grey and black tanks...
My neighbor is using it this week to clean his tanks as well - this is a device that is now built in to some of the newer RVs, because its needed and works so efficiently,,,
Scott W. 
7/31/2020
Sensor s can get fouled and distort actual tank levels this litle guy is perfect for cleaning out the tank and removing old slime, etc etc etc
The valve made flushing both tanks easier than putting a hose inside the camper trailer.
David
1/30/2023
The product works great especially when I am by myself when flushing the tanks.
I had a clog in the outlet of the black water tank. I ordered this from George on a Sunday. It shipped on Sunday much to my surprise. Came to me in excellent condition. I hooked it up and it worked as advertised. Cleared the clog and cleaned the tank. I flushed it about 3 times and was getting clear water. It also cleaned the sensors so the tank is showing empty. Its been 2 years since they have worked. Excellent product and excellent service
I just received my order this afternoon. Very surprised at the speed with which it was delivered. I am in the process of rebuilding a older5th wheel and the items that were ordered are just perfect for the job.
Thank-you etrailer I will be back
Product worked great. Black water tank was clogged bad. Paper had dried hard over drain. 1 place told me I needed another tank. Another place put chemicals in but that didn’t work. I tried snakes and nothing worked. The flush king blew the clog apart and everything worked flawlessly. Great product
Received and used Flush King today. Works excellent, this is the newer version, water is directed toward the Grey and black tanks and not toward the shut off valve., I was surprised how much came out of the Black tank.
Works just as it should. It’s really nice to see what’s going on when you dump the tanks because without this valve you really don’t know.
Being a full time RVer, we have had issues with the sensors not clearing on our gray tanks due to no option to flush. Was able to get both gray tanks cleared to empty with minimal effort. Will be purchasing another as I have 2 locations for tank draining and will definitely recommend to others.
The Flush King worked like a champ! I was able to flush out my black water rv tank and not get not get dumped on in the process. I really liked the fast delivery by etrailer also! Great company to do business with!
Great product. I backwash every tank Black and Gray. My black tanks have interior sprayers. Between the flush king and sprayers my tanks are ready for a long winters nap. No smells...
Really helps see when draining is complete. I also like that I can force water back into the tanks to help rinse them out. Water valve hard to use with gloves and sometimes leaks.
Excellent service. One item was back ordered and they gave me the opportunity to choose another item. I wanted to wait on the item. They keap me updated. Thank You.
I have ordered many things from etrailer and have always been treated very well. For this review I ordered the Flush King for my RV. Delivery was as prompt as I was told it would be and the flush King worked perfectly.
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Heather A.
4/23/2025
Hey Jeff! How is full time RVing going for you guys!? What a dream.