Waste Collector Pressure question

[Delphinus]

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.

[mr_alberta]

Thanks Tony. That's what I thought as well, but just wanted to make sure and double check.