ARO Force Piston Pumps 55 Gallon TPX Package - 1.3 GPM to 18.1 GPM (5.1 LPM to 68.6 LPM). Integrated wet cup ensures extended pump life. Reliability - Eliminating downtime, the unbalanced air valve ensures stall-free pump operation. Durability - Hard chrome plated plunger improves abrasion resistance. Versatility - Multiple mounting configurations and materials of construction for your specific application needs. Environmentally Sound - Optional muffler ensures pump meets OSHA specifications. Serviceability - Minimal part count combined with tie-rod construction for simple, efficient repairs. Typical Applications - Pumping sealants, adhesives, epoxies, inks, lubricants, urethane, silicone, and caulk.