What is this?? (Page 1/1) sdgdf AUG 09, 11:06 PM It sits on the back of the compressor, and on my 3800sc swap it sits in a bracket and helps mount the compressor. I think it’s a pressure relief? I need to know, I need a new 1 to swap to the new compressor, the port it screws into has different threads. TK AUG 10, 02:50 PM High pressure safety value. It releases pressure if the main switch fails to shut off the compressor. sdgdf AUG 10, 07:01 PM quote Originally posted by TK: High pressure safety value. It releases pressure if the main switch fails to shut off the compressor. I can’t find 1 that looks like this that’ll fit into the bracket, any ideas? I just looked it up on google. TK AUG 10, 07:56 PM Junkyard or parts store. They are common on most compressors and certainly on any GM 80's and up AC compressors. Try one from a 92-95 Buick Century or LeSabre/Bonneville, etc.