Valterra Flush King™ 45 Degree Reverse Flush Valve Attachment for RV, Camper, Trailer

Received this item on 5/21/2025. After reading previous reviews about leaks, I tightened the nuts on the valve gate and used teflon tape on the hose inlet to the 45 degree elbow. I also attached a water meter to tell me how many gallons of water were being pumped into the tanks each time. I used it the next day on my 5th wheel RV tanks (3 tanks) that are approximately 50 gallons each. I pumped in 40 gallons of water at our storage sewer dump station and this device cleaned the tanks out in two fills each. It was amazing to see what it does to clean the tanks out. The first fill flushes out most of the residual stuff in the tank and the second fill was clear water. I will use this device from now on instead of the factory clean out as this device does the job I needed it to. This device came with an anti-siphon back flow preventer to put on your hose water source to keep any back flow contamination of the water. Best part of this device is after tightening up the bolts on the valve gate and using teflon tape on the threads of the water inlet on the 45 degree elbow, there were no leaks! I highly recommend this Valterra Flush King device. But I do recommend getting a water hose meter to tell you how many gallons of water you’re pumping into the tanks too so you don’t over fill your tanks with water.

I wish I could give this 10 stars!!!! I recently moved into a new to me trailer full time and I could not get rid of the smell from my grey and black tanks. I would try to flush water down the toilet, by pulling the hose through the bathroom window and putting it down the toilet, but I couldn’t ever tell if the tank was clean or not. Since getting the Flush King my smell has improved 10 fold!!!! Although gross, being able to see what’s coming out of your tanks is SO satisfying and extremely helpful when you’re trying to clean them. I would 100% recommend this as a MUST have if you have a trailer or RV. It’s super easy to install, durable, and easy to use. Best product EVER!!!!

my black tank valve was inadvertently left open for several days, causing the dreaded TP pyramid that my black tank flush could not dislodge. I used the valterra flush king once to back-fill the black tank and it dislodged the blockage in the black tank saving me money from having to pay for a repair/tech.this is part of my normal took kit now, I have found it very handy to backfill and clean my grey tanks as well!

Must have for your camper!!! Even if you have a black tank flush, this comes highly recommended by RV tank cleaners. It works great and makes sure you have clean tanks. It also works great on your gray tanks. Fits perfectly and doesn't leak at all. Cheap and necessary. Don't hesitate!!

I got the valve for almost 50% off. Which is awesome. The Rhino valve is probably made better. But I couldn't pass on the price for this one since I needed it. Our gray tank got clogged and I tried the vinegar and baking soda and a cut off hose up the drain pipe. Neither worked. I got this in and slapped it on and it immediately unclogged the tank. It does spew over a little in some areas. But I think if I'd have taken the time to inspect and make sure it was sealed, that wouldn't have happened. It comes with a little hose attachment so you can easily attach and detach it. I took it off after use so I don't constantly run black or gray water through it. Worth the money to have on hand in case of a clog.

We had a serious clog in our black tank and were able to clear it up and clean out the tank completely. I dropped 5- 1 gallon jugs several times while my buddy worked the Valterra on the outlet and it worked great. Highly recommend it! Had estimates of $200-300 to come out till we found it on Amazon

1st year camping. Didn’t use enough water when flushing and in tank. Waited to long to dump. Purchased this product and worked well to empty black tank. Highly recommend

Saved our clogged pipes!!! Our gray tank was backing up into the tub and we tried everything from a plunger to a vinegar/baking soda mix. The Flush King worked incredibly well and unclogged it immediately!