It is a cover for a backwater valve that was going inside and I needed to concrete around. I believe it was a Canplas 2" valve. I know the stores here carry two different brands of backwater valves and I couldn't see any difference in the body of the valves so it may well fit other brands. The handle is needed to get the lid off easily after installation but it involves drilling holes in the lid to bolt it on. Consider the consequences of doing so before hand. Alternatively one could print the handle in abs and glue it on using some abs cement. The other brand of valves had a different lid that wouldn't need a handle to be added. The length will also need to be adjusted to match the depth below grade of your installation.
The author marked this model as their own original creation.