OK I get it ...
In the future I will not make fun of Liberals, Apple or Beneteau; you guys are a bit too sensitive. Some of my comments above were a bit on the lighter side and you guys took them out of context. Never been to Marion, SC but it is in the USA. Your money, your choice.
That all being said, from what I understand there are two different waste fittings and they use different size hoses and caps. There is also the issue of a wrench or a winch handle - again another distraction. I do find it pretty weird and aggravating that a BOAT THAT IS 2 YEARS OLD and cost nearly half a million dollars is built with parts that are somewhat non-standard and unavailable. I could see if this was something special, but he should be able to just walk into West Marine or any other chandlery and get the part. As I said it is not my boat, but I would be ticked off too, that just losing a stupid waste cap causes so much trouble. And yes, he could replace the entire fitting (as well as the entire hose) but the yard is telling him that some waste will enter the boat during that, they have to remove the tank to get to it and it is a royal PITA. Did I mention this was a pretty expensive 2 year old boat!