The Giant Pumps 12094 replace a worn or leaky O-ring inside unloader outlet valves. It is compatible with pressure-actuated unloader models 22910A, 22910AR, 22910AR-01, 22911A, 22911AR, 22912A, 22912AR, and 22913AR. This is a genuine OEM part. Designed to ensure a proper fit, material compatibility, and functionality with the recommended unloader models.