Household Cleaners, Cw Marsh Offers the Finest in Leather Mechanical Packings for Hydraulic and Pneumatic Systems Mechanical Packings for Hydraulic Systems and Pneumatic Systems; Advertising Specialties, Novelties and Promotional Products; Awards; Coasters; Cups; Diaphragms; Gaskets; Gifts; Leather; Packing; Plungers; Rings; Seals; Tags; Valves; Washers; Leather packings, including pump cups, flanges, u & v seal shapes. Wide variety of sizes of back up washers used to support & protect o rings available or can be custom ...