【 Quick Connctor 】: 8mm standard female quick-disconnect coupling plug, 0.5m spring soft hose. 【 Quick Bleed Relief Valve 】: With standard high pressure 8mm female quick-disconnect coupling plug. 【 Work with pcp rifle 】Can also work with PCP air rifles with compressed air from a scuba tank and fill paintball, HPA co2 tanks. 【 Easy to use 】 Simply connect each fill adapter to the male air tool fittings, the new double o-rings design, longer service life. 【 Application 】 Refill your PCP air rifles with 4500 psi compressed air from a tank or fill paintball, HPA co2 tanks.