So may car has been in the shop for almost two weeks due to AC issues. First week we were waiting for a hose. Now the issue seems to be a leaking Low Pressure Service Valve. The shop is having a hard time finding the part but I believe I came across it. However, the description of the part on the parts diagram does not look like Low Pressure service valve that sits near the firewall. Instead, the part is listed under being part of the AC Compressor assembly. I was just wondering if anyone knew the part number associated with this part and if I am onto the right part. The part I am looking at is PN #88371A. If someone on here who is knowledgeable with the SC400 A/C system can confirm that I am looking at what I need, I would be happy! I'm very stressed not having my car and I really need to get this finished.

This is what I need: