110 compressor part leaking air Spartan Scientific

[lbrachfe]

Hi All,

Noticed a air sound coming from an opening on a small part which is a 1" cube with spartan scientific 3825-od-a20g
1.6mm/160psi 2-2no
120 vac/5 watt
Viton 39070081

It is at the end of the air line coming from the compressor in the passenger side front bay and has two wires fromit and a round stem. the air is coming from a hole in what looks like a cog on the side, but doesn't turn. When the compressor shuts off there is a spirt of air that comes out and then it sounds like a small leaking or air exhaust.

IS THIS NORMAL or does it need replacement ? The compressor runs like it always has and no more often. I just have never noticed this noise before because it is so little and only heard it when fully cleaning the compartment with my head inside..

CAN ANYONE TELL ME WHAT IT IS ? THANKS