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Check the listing for details. 20pcs Service/Access Valve 1/4" SAE *1/4" OD *2.75" Stem Core Refrigeration Set. Condition: New. Listed at 14.69 USD. Consist of a valve stem into which a valve core is threaded. The valve core is a poppet valve assisted by a spring. Used on many refrigeration and air conditioning systems to allow servicing, including recharging with refrigerant such as R12 R22 R134 & R304 and other popular refrigerants.