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The OEMTOOLS R134a Manual Coupler Set is used to change your old R12 manifold set to R134a with this set of manual couplers. The The OEMTOOLS R134a Manual Coupler Set features an all metal construction and includes an adapter for Use with R12 Hoses.Warning: This product can expose you to chemicals which are known to the State of California to cause cancer or reproductive defects. For more information, go to www.P65WARNINGs.ca.gov^