ATK Recirculation Pump: Pump Housing, Pump Cover, Impeller made by high reinforce engineering plastic, motor frame of aluminum, mechanical seal type, pneumatic switch control for easy operation, single phase to ensure a long time reliable operation, the motor of quite running with thermal protector pump will self-drain from bathtub after each use for fresh water, DECO water pump it is most suitable for hydro massage bathtub or spa system.