Re: City Water Fill Crack
I would guess it's just fatigue. The threaded portion gets the weight of the hose and is also being pulled on when being filled, eventually cracking. You could forestall it with a bit of thickened epoxy as a shoulder for the threads or add a support hook for the hose when you fill it so there is no pressure on the threaded portion. Or carry a spare and figure a break every 10 years on a small, cheap, plastic part is normal maintenance...
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