Hi,
This is Kathy Long with DUI - Diving Unlimited. I came across your post about our ZipSeal system. We have a program called the DEMOTOUR which takes place across the US. You might have a location close to you. You would come out and take a look at our 30/30 drysuits and ZipSeals. We can make drysuits without valves - these would be for surface use. You can find more about the DEMOTOUR at
http://www.dui-online.com/duidemotour.html
Thanks!