OD is 1 1/2" ID is a bit fluid. There is about an 1/8" lip/ledge with a screen in the middle. As long as it fits in the housing and doesn't cover up much of the screen I think all is well. ID measured out at 1 5/16", but think the "ledge" around the outside of screen could support a 1 1/4" ID, giving it a better seal. Sorry, but don't know if can be more definite about the ID without taking the fuel pump off which I'd rather not do. What I am a bit concerned with though is thickness which isn't listed anywhere that I can find. If it's too damned thick might not be able to get the bowl back on. The original gasket was fairly thin and made of cork. I tried to duplicate it out of a cork/rubber material. Worked great at first, but seems to deteriorate rapidly, so no good. I just want to keep this thing from leaking. Not real confident that an O ring is the answer either, but I got to do something.
