Lunar Module ground support Hydraulic Fluid Filter. Filter measures approximately 7″ long, with a serial number engraved on one side and a Grumman manufacurer’s label affixed to another side which reads, “Filter, Fluid Pressure Hydraulic, P/N AC32558X8; Ser. No. 006.” Several layers of orange tape have been applied to the upper portion of the filter covering the outflow valve. Provenance: Charles Bell Estate. RR Auction COA.