The shutoff valves are just a ping pong ball that push up against where the drain line empties into the waste collector.. If I put my thumb over the drain line of my skimmer, I shut down the foam production and I don't feel a thing. It's not a lot of pressure.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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