There is no difference, none at all. In fact, you should connect all your
tanks together with 2'' hose, thereby increasing total capacity.

Scotty

wrote in message
...
On 24 Oct 2003 10:36:25 GMT, (Bobsprit) wrote:

When looking through specs on very large cruising yachts I see the terms
referring to "black and grey" water in addition to regular fresh water
tankage.
Can someone explain-is this tankage for not potable use, such as heads
and
such?


Holy Moly!

BB