50551Universal cylinder adapter for HFO-1234yf, Low SideAuto Air Conditioning ToolsAdapter & Caps & Depressor & Pilot & Insert & Ball ValveAdapter/Service PortManifold-Gauge-Vacuum-Pump-Quick-Coupler-Pressure-Gauge-Refrigerant-Recovery-UnitR1234yfADD TO INQUIRYREMOVEDETAILUniversal cylinder adapter for HFO-1234yf, Low Side, female W21.8 Left thread