Page 2 of 2

Re: Head Plumbing and Y-valve

Posted: Mon Aug 17, 2020 11:02 pm
by Dan Corcoran
yes?

Re: Head Plumbing and Y-valve

Posted: Mon Aug 17, 2020 11:50 pm
by Vento Solare
I replied at 08:51 and answered yes to your question was the problem using a Jabsco joker valve rather than a Raritan. You edited your post at 08:52 and removed the question. The Yes answer stands - Get a Raritan joker valve.

Re: Head Plumbing and Y-valve

Posted: Thu Aug 20, 2020 5:27 pm
by Dan Corcoran
Practical sailor magazine lead me to believe all these are equal.
https://www.practical-sailor.com/system ... rine-heads

Other potential clues:
* It only seems to siphon only when set to overboard, and not when set to holding tank.
* The holding tank unexpectedly filled up, perhaps siphoned water into the boat somehow?

Re: Head Plumbing and Y-valve

Posted: Sun Aug 23, 2020 8:40 pm
by Vento Solare
You have "pumping" action when the boat is set to overboard as the wave action causes differential pressure. The joker valve is shot - replace it.