Will urine ie human waste corrode 316L valves and pipe? The question is
asked because waste tanks are typically plastic, but Lloyds A1
certification requires all through hull valves to be fire proof. Fireproof
valves are typically 316L. I have purchased all my valves from the
chemical industry. I

FWIW, there have generally been bronze valves in the head on most Ocean
charter fishing boats.

Karl