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Old March 18, 2013, 12:13 PM
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SugarJ SugarJ is offline
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Join Date: Jan 2008
Location: Langley, BC
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My System Specs

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Actually, what it says is that the block is compatible with 1/2x3/4 compression fittings. It means the holes are far enough apart that you can screw in 2 of those big fittings without having to use an elbow. It can be used with ANY G1/4" fitting size. And G1/4 is the standard that all fitting makers use.

The o-rings make the seal between the block and the fitting. It's what makes it watertight. I've never been able to see them on any of my fittings once they are tight.
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