DBud 28 plumbing question

[RiverBird]

Decided to fill the gray tank to test for leaks and the gauge accuracy. Ran water into the kitchen sink.

Strange... The backup water showed up in the bathroom sink, not the tub. Hmmmm. There must be a check valve in the tub's drain line. But why??

Thanks for any thoughts


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[VinceU]

Only one grey tank? Never heard of a one way shower drain.


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[BigTJohn]

No P-trap. A one way valve for the newer drains. No winterization and drain more freely.

[VinceU]

Originally Posted by BigTJohn

No P-trap. A one way valve for the newer drains. No winterization and drain more freely.

Agree, I've read about one called Heplo or Hepflo. Its a silicone rubber bellows allow flow only one direction including vapors, used in lieu of P-traps when space is limited. That could be it!