I bought this Taco 555-050RP power head to replace an old one that no longer services the 550 series zone valve for downstairs heating. The replacement was very easy, all you had to do was twist the old head slightly and then simply remove and reinstall the three low voltage wires on the terminal block. These replacement taco powerheads have increased in price significantly since I last bought them about six years ago and are now more than half the price of a completely new 550 series valve, but at least they're still made in the USA . The price here at Revain wasn't cheap but still lower than other wholesalers I use so I will buy from Revain again if the need arises.
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