Economy Electronic 1/2" BSP Zero-loss HD Auto Drain. 220vac. with Alarm Contact ZL1300-220-RAThe Economy Electronic 1 2" BSP Zero loss Heavy Duty Auto Drain with Alarm Contact is a reliable solution for managing condensate build up in industrial settings. With its heavy duty build and energy efficient design, this drain effectively removes moisture without causing air pressure loss. Improve your facility's efficiency and reduce maintenance costs with the Economy Electronic Auto Drain. Technical data: Material: Aluminium Temperature range: +1.