R134a Can Canister Opener Canister Tap Tapper for Charging the R134a Refrigerant to Automotives Cars Boats AC Systems, 1/4 Connector or R22 Manifold Gauge HVAC Tool Heavy Duty R134a Can Canister Opener Tap Tapper for Charging the Refrigerant to Automotive Car Boat AC Systems, with 1/4 Male flare connector to manifold gauge set 1/2 ACME connection to the canister to punch hole and open it heavy duty design for the job, reuseable for decade to come as a quality tool Need R22 manifold to charge the refrigerant, 1/2 ACME version can tappers available: Tap3