641-021 air regulator is designed to be used on our industrial abrasive chop saw, non-ferrous saws, belt sanders and belt grinders. Note: GAGE IS SOLD SEPERATELY Machines that this air regulator is used on PH-14 and PH-20 chop saw air/oil power down feed systems HSM14 14 inch non-ferrous saw S8-S14 belt sanders and the old style KS390, KS490 and KS690 belt grinders