Hi there, I recently had an accident and broke my plastic septic tank lid. Can anyone point me in the direction as to what exactly these are called and where I can purchase one? I have scoured the internet and tried all local plumbers and tank pumpers and they can't seem to find one. It's about 22" wide diameter. As you can see below, where the yellow turns to green it can slide right off. All I can find online is riser covers which won't really do the trick. I tried ordering from 2 sites and one cancelled due to lack of stock on a 22" riser cover and another was $250 to ship to Canada. Any help is appreciated, thanks!