Mallard 27 black water vacuum breaker

JMJones

Member
Can someone help me with the location of the black water vacuum breaker on a 2020 Mallard 27? Someone told me it is under the bathroom sink but I don't see anything there.
 

Flick

Well-known member
Can someone help me with the location of the black water vacuum breaker on a 2020 Mallard 27? Someone told me it is under the bathroom sink but I don't see anything there.

The air admittance valve or Studor valve that you are referring to is generally plumbed into a sink area drain line just before the sink trap. They are installed high above all the other piping because they are a dry part of the plumbing.

It is possible that there isn’t a Studor valve for your sink if it was possible to tie the venting into a roof vent, etc.
 

danemayer

Well-known member
If you're asking about the anti-siphon valve for the black tank flush, on many trailers, it's behind the shower wall. It generally has to be higher than the toilet. On Bighorn and similar builds, it's behind an access port that's located by the shower controls. Here's a pic from the back side. Sorry, I don't know if it's in the same place on a Mallard.

BH Black Tank Flush Anti Siphon Annotated.jpg
 

JMJones

Member
The air admittance valve or Studor valve that you are referring to is generally plumbed into a sink area drain line just before the sink trap. They are installed high above all the other piping because they are a dry part of the plumbing.

It is possible that there isn’t a Studor valve for your sink if it was possible to tie the venting into a roof vent, etc.

Thank you!
 
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