The automatic drain valve provides "Full flow" automatic draining of wash solution. Equipped with a heavy duty electric motor and chemical resistant plastic housing for long life. They can be installed with most brands of pipeline washers and are plumbed into a 2" OD drain.
30 Day Warrantee

There are 2 types of valves as follows:

Black Motor Box - These are not watertight these have been the standard for many years.
Grey Motor Box - These are a newer improved WATERTIGHT version of the drain.