These PTFE adapters are suitable for micro, 0, 1, 2, 3, 10, 11, 12, and 13 flowmeters. PTFE adapters are connected to the threaded PP bushings of the flowmeter to provide NPTF ports for pipe-to-tubing adapters below. The internal PTFE O-ring ensures that fluid does not contact the PP bushing. Each flow meter requires two coupling adapters.