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Lynn Alexander
11-24-2011, 10:17 PM
I have recently seen some small holes drilled in the bottom portion of the valves. Have any of you seen this and/or what is the purpose and does it work?

forrest
11-25-2011, 08:49 AM
Those holes are to "vent" the valve. It allows the slide to quickly return to the closed position without resistance.

You'll want to make sure any vented valve has a stop on the slide, as there isn't vacuum to hold the slide in/on.