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SAS, I'm sure you have resolved this by now, but for future reference: the transition fitting marked for cold water use does not have an o-ring like the hot water fittings have. The o-ring allows some movement of the pipe in the fitting to accommodate the high coefficient of expansion of plastic...

I realize this is an old thread, but for future reference, some brass fittings are subject to structural failure when they "corrode" due to loss of zinc, so called "dezincification". When this happens, you can usually see a whitish deposit near the fracture.