Strange Leak

[cayovelez]

I have a strange drippy leak under my bathroom sink. It is not coming from the supply water lines to the sink nor the plumbing of the sink. It is coming from a black piece attached to 2 other water lines next to the sink. It looks like some type of aerator. How do I find out what that black part is so I can order it?

Thanks

[JRTJH]

That's the anti-siphon valve for your black tank flush system. They are NOTORIOUS for leaking and often the cause for water damage under the bathroom sink. You can buy one at any RV dealership or, as many of us have done, go to Lowe's or Home Depot and buy a brass anti-siphon valve and two fittings to connect it to the existing lines. Replacements for the OEM valve run from around $25 to $50. You can get a brass replacement for around $10.

[cayovelez]

John,

Thanks for your reply. Wondering if this will do? Of Course I have to 1/2 to 1/2 male to male.

Thanks

[srvnt]

Or this...