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Flush valve allows you to rinse out your wastewater tanks and flush out your sewer hose, breaking up clogs and cleaning tank sensors. Built-in backflow preventer keeps water source contaminant-free. Clear barrels shows when tanks are clean.
Features:
Customer Satisfaction Score:
99% were satisfied with this product
1% of customers were not satisfied
Ratings & Reviews
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!
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
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...
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
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
The valve made flushing both tanks easier than putting a hose inside the camper trailer.
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.
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.
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
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.
Heather A.
4/23/2025
Hey Jeff! How is full time RVing going for you guys!? What a dream.
Purchased this after seeing the water flow in the Camco version was significantly less. This has great flow to reverse flushing your tanks.
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!
Delivered with no damage and functions as advertised.
Does not work on my class A. The drop needs to be an inch or two greater. Can not attach. So be carefull it’s not universal fit. Mine is Thor Windsport 29M
James D.
6/30/2026
Thank you for sharing your experience, sorry to hear the Flush King wasn't compatible with your Thor Windsport 29M. While it's designed to fit many RV setups, there are some motorhomes where the sewer outlet configuration doesn't leave enough clearance for it to attach properly.
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.
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.
Works great
Great Service,
Helps me dump tanks ore efficiently
VERY impressed with product, my first time "back-flushing" the black-tank & was impressed with the amount of dried toilet paper flushed! A+++
Bought for use with our camper but haven't had the chance to use it yet. Looks/feels solid & I expect it will perform its function as designed.
Works great!! I have used this to back flush both grey and black tanks and on the black tank side (after initial flush) it has removed more solids.
Haven't used it yet! know it works from watching a friend use it while traveling together.
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.
The flush device worked very well. Got my tanks flushed out good. Thanks for a great product and great service,Mike
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David
1/30/2023
The product works great especially when I am by myself when flushing the tanks.