gray water backup

[jennian]

had a kitchen sink backup taht was solved by emptying gray water tank but i have a question on how the drains are connected since the bathroom sink nor the floor drain backed up and both are lower than kitchen sink

[Boxster1971]

Originally Posted by jennian

had a kitchen sink backup taht was solved by emptying gray water tank but i have a question on how the drains are connected since the bathroom sink nor the floor drain backed up and both are lower than kitchen sink

All drains have a HEPVO valve instead of the conventional goose neck trap. So my guess is as you tried to drain a sink water it filled the pipes and would not drain. The HEPVO valves in shower and bath sink prevented a backup in those areas.

Hepvo Waterless Valve

[jennian]

Thanks
As a newbie this forum is a great resource

[Protagonist]

Originally Posted by Boxster1971

All drains have a HEPVO valve instead of the conventional goose neck trap. So my guess is as you tried to drain a sink water it filled the pipes and would not drain. The HEPVO valves in shower and bath sink prevented a backup in those areas.

Hepvo Waterless Valve

Wish I'd have known about this before. We don't need to pour RV antifreeze down each drain when winterizing to displace water in a p-trap, just down one drain to get enough antifreeze into the gray tank to protect the seal on the dump valve.

The forums are a great resource for not-so-newbies, too!