Series 40 heavy duty 1-stage regulator regulators are extremely durable and contain our exclusive Sure Seat filtered seat technology for extended seat and regulator life in the most demanding industrial applications. They feature a stainless steel diaphragm which allows for use with liquid gases, all brass construction which will stand up to corrosive atmospheres and 2.5 in brass case gauges. Included HB190 Hard Hat gauge/regulator guard.
