Black Holding Tank slow to drain...
Our Black Holding Tank is slow to drain. Can this be caused by a bad Air Admittance Valve or a clogged vent cap or both? The tank dumps fine at first, but it eventually backs up and then very slowly...
Forum Discussion
when they cut the openings for the tanks, sometimes the plastic plug is not retrieved and it falls into the tank. that plug will get caught in the discharge tube and slow down the drains. Not a fun thing to try to get out.
