|CAH 0058 Compressed Air Housings 1/2" Connection Size (58 cfm rating). Filters are suitable for all common mineral and synthetic oils. Pressure gauge indicators standard for all models except housing number CAH0058, which uses a pop-up style indicator. Housing Dimensions(inches) 3.78 X 10.2. Select filter with housing or filter housing only. Filters are available in P-Particulate, X-General Purpose, Y-Oil Removal, and A-Odor Removal Adsorber grades.