Material - Made of Copper - Stainless Steel, they won't rust. Rated to 4000 PSI, Max Pressure: 5000 PSI, Temperature Resistance: 1000 ℃ Accuracy - NC machining, accurately, 1/8 BSPP(National Pipe Thread) Inner Thread and Universal 8mm Male Plug Refill Nipple (The Male Plug Comes Without a Valve Inside) Easy to Operation - Simply connect each fill adapter to the air tool fittings, high pressure resistance，this is one of the needed items to have in your parts kit Quick Connect Adapter - Fit for 1/8 BSPP thread. It's Time to Replaced Your old Connectors. The Best 8mm Quick Release QD You Could Ever Get! Application - Easy to Install. Fit for new replacements on your remote coil, fill station ect This is the male & female portion of a quick disconnect set. Features 1/8" NPT threads and is the standardized size that will fit any normal paintball or PCP air gun rig.