Designed for Oxygen, the 25-100C-540 is our best value in a single-staged oxygen regulator. The one-piece enclosed design has an internal filter and a PTFE Teflon seat. A chrome-plated bonnet cover its’ forged brass body. It is equipped with 2 inch dual scale gauges. It has a delivery pressure range of 0-100 & a supply pressure gauge of 0-4000.