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enlarge main vent tapping?

Main vent tapping (see pic) is undersized at 1/4" but my two Gorton #2s get hot and stop rattling when pipe gets hot beneath them. Does that mean they have released all possible air, or could they be shutting too soon due to the undersized tapping? Trying to decide if any advantage to enlarging the tapping. Pipe is 2" and 30 ft. long.


  • Fred
    Fred Member Posts: 8,542
    By the time the vents get hot, all the air is out and steam has hit them. How long does it take for the vents to close? At only 30', probably one Gorton #2 would have been enough but may have taken a little longer for steam to get there.
    JUGHNE Member Posts: 11,021
    Is that 1/4" nipple just tapped into the pipe or is it a series of reducing bushings from 1/2 or 3/4"? Is so could you remove the bushings for larger opening.

    Or you can simply tap another 1/4" nipple near the end of the main and move one of your G2 to the new nipple.