Does it need to be absolutely watertight?
Chris, Neither of the lockers in the cockpit of our boat are even near watertight but if latched with a small pad lock, wedge of sturdy wood or even a golf tee, would certainly prevent the majority of water attempting to get in. A strip of adhesive-backed foam insulation properly placed on the under side of the hatch would add further protection. What do others think? Slightly off topic: Decades ago I read an article by a fellow who went on to found his own sailboat company here in SoCal (can't remember which make), who insisted that the hasps of all lockers be installed such that the hasps naturally fall open. This was based upon an experience he had on a hot summer day when working alone in the locker of another boat when the hatch fell closed and the hasp, mounted on the hatch and not the cockpit side, closed and secured itself, trapping him in there for hours with absolutely no escape. His wife finally arrived at the boat, extricated him and the lesson was learned. For some inexplicable reason, of the two hasps factory installed in my cockpit, one was up and one was down which I changed as one of the first things after taking delivery of her. Glyn Judson, E31 hull #55, Marina del Rey CA