Found this product that allows us to connect a hose to our holding or fresh water tanks:
Bulkhead Blind Tank Fitting - Unique Solutions Inc RV Products (http://usi-rv.com/product.sc?productId=18&categoryId=4)
We have not used it.
I looked at them in one of the RV stores here when I was doing my fresh water tank fill line, but decided to make my own and caulk and bolt it on. We will see how long mine lasts.
John h
I know retailers think it's open season for RV's year round but $62 for some brass & rubber seems a little high to me. :-( I like the concept though...
see ya
ken