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Universal Adapter: 1/2" ACME Left-hand Male × 1/4" SAE Female Simply screw on to convert R-12 or R-134a connectors to R-1234yf refrigerant tanks. One-piece brass construction ensures continuous vacuum without leakage, allowing for one-step vacuuming of R-1234yf systems. Quick seal: Left-hand thread with a 60° tapered surface; easy to seal by hand. Corrosion-resistant and wear-resistant, rust-free, compatible with automotive and other connector standards., Manufacturer: YINETTECH