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Old January 13th, 2009, 09:00 AM
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Join Date: May 2008
Location: Tempe, AZ
Posts: 506
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Default Re: Screw On vs. Grommet

The only screw ons i've had problems with were the cheap-o $30 ones. I would imagine that a rubber grommet seal would be a TINY bit more air tight... being that a rubber grommet will "form fit" the opening it's in. But i think the difference from a quality screw on to a grommet seal will be minimal, say 98% for the screw on and 99% for the rubber grommet.
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