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Refrigeration 1/4 3/16'' 1/4'' 5/16'' 3/8'' 1/2'' Copper Access Valve Cap Pin Valve, Find Details and Price about Air Conditioning Access Valve Refrigeration Access Valve from Refrigeration 1/4 3/16'' 1/4'' 5/16'' 3/8'' 1/2'' Copper Access Valve Cap Pin Valve - Ningbo Domi Refrigeration Co., Ltd.