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Flush King

Catalog Item # 20522
This Item is In-Stock and Ready to Ship
$66.99   SAVE $27.05 (40%)
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Flush King Reverse RV flush valve provides you with the quickest and most effective way to fill, rinse and remove residue from your black or gray holding tanks.
Flush King rapidly refills the holding tank no matter what height of tank or angles in plumbing. Unique design eliminates messy wands and hoses inside the RV by allowing you to reverse flush your tanks from the outside. Powerful performance removes clogs in drain pipes and improves sensor performance for more accurate readings. Four locking hooks provide a tighter seal to guard against leakage. For your convenience, the handle swivels 360 degrees to make hook up and operation easier. The innovative clear barrel allows you to see when the tanks are completely clean of residue, so there is no guess work.

Flush King fits all Trailers and 5th Wheels and most Motor Homes and is not a permanent attachment. Twist on and off, how easy does it get! Connect the Flush King to your RV's sewer pipe and your sewer hose to the valve. Now you are ready to dump, rinse or clean your tanks in one easy operation! When you are finished, simply remove the Flush King and store it away.


  • Removes remaining residue in the gray and black tank after dumping
  • Improves sensor performance
  • Eliminates messy wands and hoses inside the RV
  • Works on Motorhomes, Trailers and 5th Wheel RVs
  • Clear barrel allows you to see the cleaning in action
  • Sanitary and efficient, no other product on the market does a complete job like the Flush King
  • Fills tanks at any height or angle of plumbing
  • Backflow preventer included
  • Non permanent attachment
  • Easy to use and connect

Technical Specs

Tech Specs

Weight: 1.8 lbs.

Manufacturer: Valterra Products Llc

Mfg Part #: FK-02/F02-4350

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Flush King: Customer Reviews

Camper's Choice Rating

(5 Based on 167 Reviews)

Easy to use (4)
Clear to see (2)
Cleans tanks very well (1)
Have to take off and store (1)

Reviewed by 167 customers


Clean and easy

70 out of 73 people found this review helpful.
February 08, 2003
Use this for every dump. Like the fact that I can see through the clear area what is coming out. I close the Flush King valve and back-fill the tank. Keep doing this until only clear water flows from the tank. By filling the tank through the drain it will move any solids built up at the tank's discharge. After dumping both tanks I run some water down the hose and I'm done. Clean and easy.
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Everybody Needs One

23 out of 24 people found this review helpful.
May 29, 2003
This is absolutely great; gets the 'hidden extras' out of your black tank; very easy and convenient to use on all tanks.
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76 out of 78 people found this review helpful.
June 16, 2003
We used to have problems with smell and sticking sensors. NOT ANYMORE! We used the Flush King for the first time this past weekend. After filling the tanks completely and flushing a couple times, the sensors now seem to be accurate and the smell is GONE! It was EASY and worth the initial cost.
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Q & A

Product Question & Answer

2 questions : 2 answers
Expand All
My handle pulls straight forward, not up/down. Will this King still work?
1 answer(s)
How does this attach to the sewer lines on the trailer?
1 answer(s)

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