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I own a condo in a commercial building that uses chilled or heated water (depending on season) in the HVAC. The controlling valves in my two systems are Honeywell: 120 VAC, two position zone valves with aquastats, and both have failed. I was able to locate one powerhead,part number 40003916-045, and fixed one valve, but have not been able to find a second powerhead. Honeywell does not make these anymore. I would appreciate any leads to HVAC companies or suppliers that might have one of these in the back room or warehouse. Thanks.