This low-pressure air-line hose for supplied air respirator system is made of polyvinyl chloride and comes in black. It has a 3/8 inner diameter x 19/32 inch outer diameter and 25 feet hose length. The air-line hose has an operating pressure of 185 psi and an operating temperature ranging from -20 to 150 degrees. It has 1/4 inch OBAC fittings and meets the NIOSH standard.