Had another prior that's been fine, but this one will not for the life ...

Just doesn't work. Had another prior that's been fine, but this one will not for the life of me stay attached. Thought it might be me, then had a handy man friend try, then a plumber friend, then my DAD, who literally built his own house form the ground up (he and my granddad had an HVAC comp. for 55 years, but well-versed in old school everything fix it). Stinks, because way past return date.

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