Forum Discussion

afinepoint's avatar
afinepoint
Explorer
Jul 24, 2013

Spec for black water tank is 34 gal yet 21 fills it???

The volumes for the black and grey water tanks in the RPM TH are 34 gallons each. When filling and flushing the black water tank I realized that after about 21 gallons water stood in the bowl and wou...
tvman44's avatar
tvman44
Explorer
Jul 24, 2013
I believe the builders lie about capacity. Mine is supposed to be 40 gal, but when it is full all I can get out of it is about 25 gallons, sometimes another 3 or 4 gallons. :)

About Technical Issues

Having RV issues? Connect with others who have been in your shoes.24,354 PostsLatest Activity: Jan 23, 2026