WM521 - Activair Controllers

The WM-521 series controllers are 4-way precision regulating valves which are factory assembled into banks of up to five units. For plumbing convenience, WM-521 models with 2 or more valve units have a single inlet and a common exhaust port. WM-521 control levers spring return to the neutral position when released and are developed with push-to-connect fittings. Special models are available for field replacement of WM-501 units.

For more information on WM521 - Activair Controllers talk to Williams Controls