All Safety Caps are supplied with an air valve and corresponding fittings. PFA fittings, PTFE body and PPS screw cap meet flammability class V-0 (UL-94) requirements. Blind plugs are supplied to close connections that are temporarily inactive or not in use. All Safety Caps are supplied with an air valve and corresponding fittings. PFA fittings, PTFE body and PPS screw cap meet flammability class V-0 (UL-94) requirements. Blind plugs are supplied to close connections that are temporarily inactive or not in use.