The original AUTO-PURGER, the AP Auto-Purger has solid-state control and is ideal for larger systems, up to 1500 tons (5275 kW).

The Non-electric NEAP AUTO-PURGER is ideal for smaller systems up to 100 tons (350 kW) ammonia.

The AUTO-PURGER PLUS is a totally automatic, electronically controlled non-condensible gas (air) and water purger for reducing the energy costs of operating an ammonia refrigeration system.

A compact version of the original AP Auto-Purger, the APM Auto-Purger is ideal for medium size systems, up to 200 tons (703kW). Like the AP, the APM features automatic start-up with electronic control.