Reliable, Leak-Free Connection – Compatible with Most PCP & HPA Fill Systems The Best Fittings QC02 Quick Coupler Socket is the trusted choice for shooters and air system users needing a safe, secure, and consistent air fill solution. Built with a 1/8" BSP male thread, it fits most hand pump and air cylinder fill lines, making it ideal for PCP air rifles, paintball markers, and airsoft HPA tanks. This QC02 socket is engineered for high-pressure systems up to 300BAR / 4500psi and incorporates an internal flow restriction device to improve safety during refills. It’s fully compatible with the QC03 plug and suitable for most popular brands including Daystate, Benjamin, Brocock, Crosman, Ripley, Logun Eagle, PCR1, and more. Key Features: 1/8" BSP Male Thread – connects easily to most air fill hoses and lines Max Pressure: 300BAR / 4500psi – safe for use with high-pressure air systems Internal Flow Restrictor – helps prevent rapid overfilling Wide Compatibility – fits most HPA tank side fill nipples and PCP rifle valves Ideal for paintball, airsoft, and pre-charged pneumatic (PCP) airguns ⚠️ Note: Do not exceed maximum working pressure. Always ensure compatibility before use.