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Armstrong Float & Thermostatic Steam TrapsArmstrong is one of the most trusted pump manufacturers in America. At National Pump Supply we stock numerous Armstrong pumps including their Float and Thermostatic Steam Traps. Steam Traps are automatic valves that allows the air, condensate, or any other non-condensate gases to be discharged from the steam system to escape, while trapping the steam within the system. These traps are especially useful when the steam pressure varies from t …