General description Push-fit couplings are an economical, quick, and easy way to create your own workshop ring main air supply, as well as pipe work for water, beverages, and inert gas supplies. These plastic push-fits are a lightweight solution that will not corrode, making them ideal for professional workshops. Technical specifications Size: 4mm x 4mm PSI Range Temp range 1°C - 64°C: 230 PSI PSI Range Temp range 65°C +: 150 PSI ISO Certification: ISO 9001:2008 ANSI/NSF: 61 Quantity: 5 pieces Other information Unique collet design for quick and easy connection and disconnection.