Reefer 170 need help

[nly04]

I have an reefer 170 that i keep getting small leak on the middle pipe (emergency drain pipe). I end up to add talon tap and try hand tight it but end up found out the base plate and ring nut were crack. I am in big trouble now, I was able to move all the live stock and ask friend to help to keep them. How can I replace the base plate and get new nut? It is urgent and I really need some help.

 

[reef lover]

If its not a removable bulkhead you can replace then im not sure.
Heres a bump for you.