Yep, that is a quick disconnect. It was there for assembly in factory. They could have a vacuum pulled or freon in with it disconnected and then just hock it all up on the assembly line. That's why the hoses that hook to the pump had valves too. Later trucks they did away with this stuff. Those orings weren't in my reseal kit either. I ended up swapping on a newer style hose. Also the screen I think you are looking for is the orifice tube. If you separate the line going into the evaporator it is down in the evaporator inlet tube. If you are doing a 134a conversion now is the time to install a 134a orifice tube while you have it apart.
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Do you have any details on the newer style hose you installed? I have the new orifice tube ready to put in with the new drier once I get what I can figured out on the system. There was a little bit of debris on the old orifice tube but the hoses on the compressor all looked clean inside.
Update this morning the system held some vacuum, but has dropped down from -30 in Hg to -11ish in Hg. So there is some leak, but won't be easy to find I fear. Ordered a new compressor and figure I will proceed with that route and will charge the system with some dye and check it with a sniffer.