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MERMADE LEVEL CONTROL VALVES — For water level control in open top vacuum DE filters and surge tanks located below water level. Water activated by water pressure from circulation pump. Powerful spring actuator closes butterfly valve, with positive shut off, due to loss of flow or power failure. Cast iron body, with nylon coated aluminum bronze disc, and EPDM seat. Pilot valve assembly ordered separately. Minimum 20 psi air or water pressure required.