Hello, is there a climate/refrigerating system technician on the way here, who can tell me where to get this fitting? Background: The air conditioning compressor of an air conditioning service unit no longer runs (condenser tested, start relay tested, compressor seems to block, then pulls current until the internal temperature protection triggers. Sometimes it seems to build up minimal pressure and when you switch power off, it seems to run backwards because the piston turns the engine in the other direction. W The two are ok, connections are pressureless, so no too high back pressure. Relay has passage, if you hold it upside down. Without starter condenser it only buzzes, so it seems to be heading in the right direction. I no longer have a defect, why ever. . Plan is now to get replacement compressor and let the fittings solder hard from a climate operation. Or the old ones solder off, but I lack the experience, if this is so easy when soldering hard. connections/threads are SAE 1/4 or 3/8. The larger connection looks soldered together, T-piece with one side screw valve, then above an adapter SAE 1/4 to SAE 3/8, third side tube? When soldering I first thought that the adapters are plugged into the tube on the compressor and then hard soldered, but when looking more closely they seem to have put the fitting outside on the tube. (Normally one would plug in a tube 6 or 8 mm). it is the thread, because the counterpart has a collar and an O ring, in principle the same connection as e.g. on the filter dryer. I have already searched through many air conditioning shops and catalogs, I don’t find these parts, they are mostly SAE connections with rim or directly larger/other calibers. Questions therefore: 1. Does someone know a source of supply (I fear that a climate operation does not have such a thing in stock (or is it common material after all?) 2. et solder again and simply solder on the new compressor, if necessary clean/drill a little, so that you have a clean gap. (Of course, when soldering/dissolving rinse with N2). 3. Is there anything else about the compressor?