Posted 5/24/2016 12:47 (#5317968 - in reply to #5317933) Subject: RE: Sprayer gaskets grow?
Southern MN
Not all o-rings are made out of the same materials, and they react to chemicals differently. I learned that when using WD-40 on some one time, they swelled up to be unusable.
Are you putting Anti-Freeze in the sprayer over winter? Its possible your o-ring material and anti-freeze of choice are not compatible.