Design for , CO2 gas bottle with W21. 8 outlet, allows to reduce the pressure of gas from a bottle to desired level Twin pressure gauge, easy to read, helps adjusting the outlet pressure in high precision. Flowmeter is back pressure compensated to accurate readings when line restrictions are present. Polycarbonate flow tube and outer cover are impact for maximum durability External valve equipped, auto released outside if the pressure over safe level. Specifications: Inlet pressure: 0-20 mpa / 0-315 bar Output pressure range: 20-22 mpa Flow: 0-20L / min Inlet thread: W21. 8 x 1/4 Colour:As Shown Material:Metal Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. The actual product may have slight color difference or difference, which not affect the use Package Contents: 1 x Pressure Regulator Only 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.