Recently installed pump leaks, mostly from the cover plate. Opened it up, the O ring looks o.k. but thought to replace it. However, it appears not to be a regular one, but a flat sided O ring. Am I correct? I'm presuming it's not recommended to use sealer on the plate perimeter, so are these O rings available? I have part #s for the pump attachment gasket & pickup tube to pump seal, but not for the O ring. Any help appreciated, thanks- Paul

Paul