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The grab ring is what physically secures the tubing inside the fitting by biting into the tubing. The angle of the grab ring teeth causes the "bite" to be greater as the tube pressure or load increases, up to a point. At some point, the grab ring will usually bite off the tube or the grab ring will invert, allowing the tube to become disconnected.

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Q: What is the purpose of a grab ring on a push fit plastic fitting?
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