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microbubble resorber leak

Today, I noticed that my Spirovent microbubble resorber, which is inline 2' above the supply outlet, is leaking. I also noticed a small drip at the relief valve extension. My boiler is a c.i. Weil -McLain, 7 years old, the pressure is 11.5psi at the expansion tank, and appx 20psi at the gauge at the boiler. Any suggestions?


  • hr
    hr Member Posts: 6,106
    Where is the leak?

    Sometimes those leak at the o ring seal between the upper and lower pieces. You may be able to disassemble and put some pipe dope on the threads and o-ring.

    If it is leaking from the vent, not much you can do to remove and repair that part. Buy another one and unscrew the top haf, or remove the entire vent and replace.

    What type of system? Early non barrier radiant tube jobs were (are) unusually hard on Spiros. Rust and corrosion particles would stick in that small bleader seat.

    If the relief valve is dripping, and the pressure is below the pop pressure, replace it also. Not much to fix on those. A safety relief valve, that works, is an important part of your system.

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