he Giant Pumps 12055 replaces damaged, leaky, or worn O-rings inside of pumps and unloaders. Design for compatibility with BP6150, GP5122, GP5124, GP5136, GP5142, GP7128, LP122A, LP200, LP200-5100, LP200-SS, LP250, LP250W-MT, LP250-5100, LP301A, and LP301A-4000 pumps. Also compatible with 22982 and 22982R unloaders. An OEM part designed to ensure a proper fit, functionality, and material compatibility.