Trinity Cga 320 Aluminum Adapter for Paintball Co2 Tanks, Cga320 Male Thread Adapter for Paintball Co2 Tanks, Fast Shipping With this adapter, you can attach a CO2 regulator with CGA 320 thread to a paintball CO2 pin valve cylinder Enhanced safety feature: pressure relief hole relieves overpressure when dettaching the adapter from CO2 cylinder use for CGA 320 CO2 regulator thread to paintball CO2 cylinder pin valve