Not sure the proper term for them but does anyone know where to get them. I am missing a couple and the others are not working very well since they came with the boat and never been replaced. These are hatch covers to my batteries, floor storage, etc.

Lowes actually has some marine grade weather stipping available now. its made by Macklenburg Duncan.

might want to think about the armstrong hatches - they are 100%watertight - none of my other hatches were

If your hatches are in the engine well or another area that gets a lot of water - those are my favorite

You may be able to find small tubing and make your own, if you cant find the right size O-ring. I know the marine surplus place here sells new hatches of all kinds, maybe they sell O-rings too.