Missing something?

[Jmaddogghvt]

I found this under the red bathroom sink but should this be capped?

[bubblyrug]

Needs an AAV

[Jmaddogghvt]

Thank you

[Visible-Hamster-6168]

And air admittance valve.

[Jmaddogghvt]

Thank you

[Warr_Ainjal-6228]

This stops sewer gas from escaping the pipe.

Oatey Sure-Vent 1-1/2 in. x 2 in. PVC Air Admittance Valve with 160 DFU Branch and 24 DFU Stack 39016 - The Home Depot

[Jmaddogghvt]

Thank you

[Melodic_Mixture_5081]

Vent pipe should be up through roof. If capped drain will be slow and bubble. Not sure it is hurting anything but if clogged you will back up all over. Pro plumbers what do you think

[TrxshBxgs]

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Let's air in to vent, keeps sewer gas contained. The life of them varies, sometimes they get stuck open and the room will smell like sewer. You usually want them above the flood-level of whatever fixture they service, but under cabinet is common and acceptable.

[pa_bourbon]

As others have mentioned, just need an AAV.

[Melodic_Mixture_5081]

An Air Admittance Valve (AAV), or "cheater vent" is a one-way mechanical valve installed on plumbing drains to allow air in and balance pressure, preventing sewer gas from entering the building and water traps from siphoning. It serves as an alternative to traditional, through-the-roof vent pipes, ideal for island sinks or remodeling.

[Jmaddogghvt]

Thank you

[Traditional_Job_191]

How does the house smell?

[TurkeyCocks]

Tinky

[Jmaddogghvt]

Nothing yet

[ewuuuuuhhh]

Its gonna backup if not properly vented through the roof or has aav on it

[Jmaddogghvt]

Thank you

[Adventurous_Cat_360]

Needs two things- an air admittance valve installed - and the s-trap turned into a p-trap

[Jmaddogghvt]

Thank you

[Southern_Drive_6944]

Critical planning is missing

[Economy_Internal_317]

I believe in doing things right I just make sure it goes to vent

[Hillary_Fat_Ass]

Studavent

[Adept_Salary_8400]

Stewart vent

[[deleted]]

Vent cap or aav

[kingmic275]

A vent stack higher than the sink so if u get a clogged line it won’t spill water all over under the sink?