Removes dirt and oil contamination from compressed air. Required if using an oil-type compressor with your GRS equipment. The Coalescing Air Filter / Oil Removal Kit has been updated from the previous version (#004-579) to utilize a new spacer-bracket that works to connect the two filters and to provide a mounting bracket all in one piece. Use this kit to remove dirt and oil contamination from compressed air. Installation and proper use is required if using an oil-type compressor with GRS equipment. This kit requires two screws for wall or bench mounting (not included); use #10 or M4.8 pan head sheet metal screws or M5.0 pan head machine screws. Fittings are designed for 1/4″ hose. A metric version of this product (#004-730-6MM) with fittings designed for 6 mm hose is also available.