Tube pressure WP: 5000psiWatch type: 2000psi color back watchUse For Terra DUO Quick Connect Machines.This item works CO2 only, not liquid CO2.It can't use siphon tube Co2 Tanks Please don't disconnect the quick disconnect under pressure, it will be blowed out the o ring in quick disconnect(female QD),suggest drain residual pressure on Machines.How it works:Screw the Nut to CO2 gas cylinder and tighten it by wrench.CQC adaptor connect the quick coupler.CQC adaptor connect into machine.Open the valve of the gas bottle.Done,you can use your machine.if you want to unscrew the item from the machine:Close valve of the gas bottle.Press button of machine to drain residual Co2(if you don't follow this guide to disconnect the coupler, the o ring of quick coupler will be blowed out)Unscrew CQC adaptor from machin and unscrew Nut from CO2 gas cylinderType:CGA320Allows External Tank Cyclinder Valve Connector Thread CGA320.CGA320 connector CO2 Tank Common in USA, CAN, Brazil, Colombia, Philippines.color:BlackMaterial:Metalsize:Tube length: 1.5mPackage Contents:1 x Co2 Tank Adapter Hose KitOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.