: They're supposed to have an o-ring on them. Yours doesn't?

: http://www.beckson.com/screwout.html

: Notice that after each deck plate, they list the replacement seal.

I could have sworn that these hatches used to have gaskets but wasn't sure. The new ones arn't supplied with them, or at least not all of them. I've got two now and neither of them came with gaskets. The ones I have now have the supplied fabric bags on them, maybe that's the difference? Perhaps it's an option?

I've got a whole bunch of them in boxes somewhere (along with about half of everything I own) no point in digging looking for something that small, figured someone else would have the correct info :)

One of my many winter projects is to get my new shop up and running, then I can actually put stuff away and find everything, or most things .

Bill H.