2.1/2" BSP Parallel Female, Air Filtration, Purification & Separation, Oil- X Evolution Grade AOP Dust Filter, Flow 19.1 Cubic Metres per Minute, 1188 Cubic Newton Metres per Hour, 699 Cubic Feet per Minute, Working Temperature +1.5??C to +100??C, Maximum Working Pressure 20 bar, Domnick Hunter