Use to connect a R-1234YF refrigerant tank to R-12 or R-134a hoses Adapters: ACME w / LH threads female X SAE Male and a SAE female X ACMER1234YF Tank Adapter for R12SpecificationsDimension: 3 H x 3 W x 5 Weight: 0. 1 lbs Warning: This product contains chemicals known to the state of California to cause cancer and birth defects or other reproductive harm.