This is a FUS303 Supermix II Dispenser. This is a pneumatic 380ml dispensing gun. For use with GM approved Fusor #120 & #T20 12.8oz (380ml). Coaxial cartridges convertible from 1:1 to 2:1. Includes air hose regulator, 2 retaining nuts & 2 valve handles. Rates for 100 psi of dispensing pressure. Super high-performance tool.