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Check the listing for details. Refrigerators Maintenance Valve 3.4 Mpa Air Conditioner Copper Copper Tube. Condition: New. Listed at 15.81 USD. Safe working pressure: 3.4 Mpa. Suitable for refrigerators, air conditioners, refrigeration compressors, refrigeration air-conditioning units. Easy to use. The plumber shall conduct a leak pressure test on the pipe fittings.