I was maybe looking at the possibility of chopping off the nipple (in a decent spot- if it could be done) Carefully drilling (maybe tapping)/ epoxying in a threaded brass/ plastic replacement nipple.
As I said/ implied, if it will work, enough room with what's left, if the damage is not further into the valve. It Cannot interfere with the workings of the valve!
Brass hose fittings come in various hose sizes and also different other ends ranging from pressed fits to straight threads or National pipe threads, even metric stuff.
Basically the valve is a vent for the tank which closes if the tank becomes somewhat upside down in a mishap. You just need a good seal which would still allow the check valve to operate and the vent still work as it should. But only if this repair is feasible.
Just a thought,
Monday, December 4th, 2017 AT 7:40 PM