11 heating, ventilating and refrigeration apparatus, namely, electric pumps, pumps for air-conditioning, piston pumps, machine tool lubricant pumps, ice machine pumps, reservoir pumps, circulating pumps, parts washer pumps, tank pumps, centrifugal pumps, condensate pumps, condensate evaporators, refrigeration pumps, drain pumps, evaporative cooler pumps, and check valves