Air Conditioner Service Port Hose Adapter

R-134A Recharge Hose Adapter Allows Use Of Older Piercing-style Recharge Hoses w/ R134A Cans Equipped w/ Self-Sealing Valves. For Use Only On R134A Cans With Self-Sealing Valves; Will Not Pierce Older Style Cans. Will Not Pierce Older Style Cans.