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The Head
Defiant has a Raritan Electroscan self-contained USCG Type I poop zapper - it is a tiny, self-contained sewage sanitation system. With the Electroscan every flush triggers a ~3 min cycle that super-macerates the effluent, then injects brine to electrolyte-prime the effluent, then shocks the shit (literally) with up to 60Amps at 12v, and then finally purges the sanitized goop overboard.
The toilet is a freshwater Dometic MasterFlush. When servicing the Electroscan, the female threaded output port has weakened and somewhat cross-threaded. to deal with this I added a threaded schedule 80 PVC close nipple to the toilet; but I needed to get it sealing again. So I packed the threads with 3M 5200. If you are not familiar with the 3M 4200 and 5200, they are the go-to sealant for things on boats. 4200 is what is used almost everywhere and is extremely effective for sealing screw holes in the hull and deck, any water-exposed hardware etc. 5200 is so permanent that, well... if you were to meet God during your voyage, 5200 will glue him to things in a way he cannot unglue.