Stainless steel quick disconnect. Designed for leak-proof reliability it features a spring-loaded 5-ball positive locking mechanism with knurled lock ring. Standard 1/8 inch NPT threads. Designed for any standard Paintball CO2 application (NOT unregulated HPA pressures). Perfect for remotes. Two-piece (male & female) unit measures 1.75 inch long connected. (Note: Filling should only be handled by CGA trained & certified personnel! DO NOT attempt filling without proper training.)