Rotalock discharge fittings for R-134a refrigerant. The discharge fitting has 3/4″-16 threads for the discharge hose, and 1-14 thread for the compressor fitting. The fitting also has a 16 mm charge port. . The fitting is made of steel and uses O-rings on both connections and Teflon seals where the fittings fit onto the Compressor. This fitting is common on York Compressors. Please make sure the York you are mounting this to is not a Tube-O fitting, refer to pictures to see the difference between a Rotalock and Tube-O fitting.