George,
I'm re-invigorated with your "bubble" idea. I used to do this but got tired of my 25 gal compressor cycling all the time. Once I get my new IR 60 gal 175psi compressor (next few weeks) I might run some PVC air line and give it another try!!
The other problem I had was regulator drift. The level you need is in the "noise floor" of the regulator.
Do you know if there is a pvc-compatible regulator out there that would be optimized for <5psi applications?
Kind regards,
Ken
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