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Heat-Timer main vents

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A supply house in S. Philadelphia has told me that Heat-Timer main vents work on 2-pipe systems. Alternatively, I found that Heat-Timer's website says that their VARIVALVE main vent valves are for 1-pipe systems. I'm waiting for a call-back from Heat-Timer. Is there a typo on their web page or is it missing a new product that isn't shown there?
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