On 04 Nov 2004 22:10:52 GMT, Stephen Baker wrote:

Valve is a better word.

http://www.valterra.com/Ind/Gate.htm

Used on water-ballasted Open Class boats for years.

Steve
Stephen C. Baker - Yacht Designer
http://members.aol.com/SailDesign/pr...cbweb/home.htm

Are they sold on the consumer market, or are they only sold to enginering
consultants, system developers and alike?

Are they heavy?

Morgan O.