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Vent-Rite No. 35 on mains???

i have  two 2 1/2 mains one 20 feet and one 28 feet these are vented sadly of 90 elbows with vent-rite NO. 35's. not sure they will work for long being at the end of these runs. mains are currently uninsulated this will be insulated this winter and would like some flushing advise please. the radiators have vent rite no.1's and those look fine.

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