I have a bag i never got around to using, I just used tinnerman nuts on the plywood with stainless panhead screws right through predrilled holes. I dont carry loads of gear so I'm happy.

But those same rubber gaskets costing 5cents a piece at the local hardware store that make my screws watertight and keep the screws from digging into the lid (and are underneath my footbrace screws protecting the hull) also can be stretched over the DZUS Stud. And if the receptacle is located in the middle of the foan field, the thing should not leak up to a few feet of pressure.