Low side refrigeration gauge, dry cleaning part 0804003, for compatible commercial dry cleaning machine refrigeration service. Union Drycleaning references may use the shorter Union number 080403; the Firbimatic master parts list identifies this as gauge low side refrigeration part 0804003, old reference F7594. Use this replacement gauge when servicing equipment that requires the same low-side pressure gauge specification. Verify part number 0804003, Union reference 080403, old reference F7594, gauge range, connection size, mounting orientation, and machine fitment before ordering.