Promask positive pressure facemask for use with RAS system, 5 point fully adjustable head harness, featuring a left hand bayonet fitting for the demand valve and right hand DIN40 fitting with inhale valve for respiratory anister.Halo-Butyl positive pressure full face piece Non-dermatitic Standard rubber harness LQF (Left Quick Fit) standard demand valve connection DIN4 0 fitting with inhale valve for respiratory canister* Promask  is produced in a choice of two sizes to ensure suitability for a wide range of users.