Answered What is this

[Webz]

Found this leaking under the 1/2 bath sink. It is leaking under the square head on top. Thanks for your input

 

[Neal]

That is your black tank rinse check valve. Cheap plastic part, I replaced mine with a brass setup.

 

[Webz]

Where do you find one? Amazon or the dealer?

 

[Neal]

Don't do your black tank rinse until you fix that! I think these are the parts per my Amazon order history that I used to replace it:

Amazon.com : Valterra 1/2 Inch P23415LF Brass 1/2" Check Valve x MPT : Automotive

Watts Water Technologies 1/2 LF288A Watts 288A Anti-Siphon Vacuum Breaker 1/2 In., Brass, Lead Free: Plumbing Equipment: Amazon.com: Industrial & Scientific

https://www.amazon.com/gp/product/B000BQY9XW/?tag=rvf01-20

https://www.amazon.com/gp/product/B0015ASX12/?tag=rvf01-20 (not this one, I think this was for some other fitting, 3/4" is for garden hose type plumbing)

Contact Newmar parts and they can send you a replacement of that exact one. For many it was a cause of odor and the resolution was to replace it with the above parts.

 

[Webz]

Thanks Neil. At least it is something I can get too.

 

[Webz]

The new valve arrived and is installed. The new one is brass. Thanks to all for your input.

 

[Neal]

Dagnamut, I've been meaning to provide you a picture of mine. For future reference:

 

[Webz]

Thanks Neal.
It was a pretty straight forward swap.
Afterwards I flushed the tank for 10 minutes and had no leaks.