|CAH 1300 Compressed Air Housings 3" Connection Size (1300 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) 9.25 X 32.12. 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.