This great "rockman" CO2 controller not only made by stainless steel and also with better anodic treatment increase the surface thickness and hardness while has higher resistant to corrosion and anti rust. The treatment also provide adhesion for paint in green with the laser engraving logo "ISTA" looks professional and high quality. The precision needle valve of the controller which has better precision fine adjustment assures accuracy and reliability in dosing the CO2. Simple and easy - no tool required, just hand and air-tighten.