Posted by: slushpaddler on Oct-11-12 4:15 PM (EST)
Both kinds of hatch design can be watertight. Personally I prefer the one-piece rubber tupperware-style hatch. One piece instead of two, and I've never owned a composite kayak in which they leaked.
Deck Rigging Gear
URCHIN Portable Anchor
Hardshell Kayak Sail Rigs