I still have mine from my previous coach. I have a built in flush now.
When we used the flush king it did as it should. The first few times you use it time yourself on how long you "back-wash". Keep in mind depending on the amount of water pressure at the campground will have an effect on how much water you receive in a certain amount of time. I use to flush three times. Once for 8 minutes, once for 5 minutes and once for three minutes. I naver had an issue with build up or faulty gauge readings.
(I still have mine but do not use it) PM me if interested.
 
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Tiffin Allegro Bus, Honda CRV, Tow-N-4 Down, US Gear Unified Tow brake, Blue-OX tow bar, Dually Valve stems, TST Monitors, No Kids-No Pets, Full Time Wanna Be
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