Lakos Manual Purge Kit provides manual purging ability with the added advantage of a clear tube that allows you to actually see when particles have built up and need to be purged. There is a ball valve on the device that is opend manually to purge all particulates out of the holding chamber.

This is not an automatic device, but can be easily converted to automatically purge by installing a solenoid valve connected to an extra watering station on your sprinkler system controller.