I have a puzzling problem on my refrigerator (a KitchenAid built-in). The high-side service port looks like I expect, and I can connect my manifold gauge to it just fine. But the low-side service port (on the compressor process tube) is of some different type.
It’s hard to tell exactly, but the low-side connector appears to contain some sort of recessed structure inside the open cylinder: perhaps a half-circle on the left side, and maybe a point or pin on the right side. But its very hard to tell.
Anyway – Is this some sort of well-known connector? Is there some adapter I can use for both (a) charging and ( low-side vacuum pressure check?
Oh yeah - R134a refrigerant.
I tried to post a picture, and it seems to show up in the editor, but just showed up as "\" in my post. Is there any way to post a picture? Any size limits, or other guidance?