[GMahanna]

Hi

I have 2 problems maybe related

1.waste cap no longer seats in threads on through hull fitting tried numerous new caps Easy to replace both??

2. Vacuflush made by Domentic keeps cycling to gain air pressure even though new pump

The pump cycling is to to a vacuum leak. The pump does not create pressure. It creates vacuum.  There is a leak somewhere in the system or a bad vacuum pressure switch.  A common problem is the duckbill valves, which are one way rubber valves on either side of the pump.