Delta Universal Showering Components Auto Drain - 240vOur auto drain is an optional accessory that automatically purges water from the system after each steam shower. Features: Auto Drain automatically purges the system by gravity once water in the generator cools Connects to a factory installed auto drain terminal block, located inside the generator cabinet Valve body with 1 2" NPT female brass connection For use with 5GE SMP 240v steam generators. The voltage should match the voltage of your steam