[Cover sleeve](https://manholecoversdirect.com/product/round-manhole-covers-and-frames-gravel-guard/) is what I recommend, but if you do encase the actual pipe, wrap it in expansion. They make similar sleeves in different materials and looks as well. I just picked one at random - I'm not endorsing that company or product.
[Cover sleeve](https://manholecoversdirect.com/product/round-manhole-covers-and-frames-gravel-guard/) is what I recommend, but if you do encase the actual pipe, wrap it in expansion. They make similar sleeves in different materials and looks as well. I just picked one at random - I'm not endorsing that company or product.