1995 Fleetwood Tioga Montara - hot water tank leak

1/2 PB is the grey (now banned from homes) stuff, 1/2 Schedule 40 is the black pipe. Boy are those PB to PEX (and PEX itself) DIY (push lock) fittings expansive.
If history is correct, likely need to convert the entire RV from PB to PEX. In this case, better get the PEX compression tool to use those cheap crush rings and fitting; the DIY are about the price of silver (per weight). Hope I have enough space to get the PB to PEX converter, PEX pipe, PEX 90, pipe, PEX female 1/2 inch all in there!