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½" ACME LH Thread for R1234yf self-sealing, re-usable cans. Designed to work with SAE J2844 fittings. The R1234YF self-sealing can adapter is made of high quality brass alloy, last under extreme conditions and for durability and safety, perfectly seals to prevent leaking. The AC frezon R1234YF self-sealing can opener features hand operated punch/valve control, and safety check, making it very easy to handle.Warning - This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm.