We recently purchased a home where the sewer cleanout has a cap that looks like black plastic and it is not a solid cover but is slotted so rain or dirt and who knows what else could get in there. I noticed on walks around my neighborhood everyone else has solid metal-looking caps (our caps are all in the front yards). For what purpose would our house have a slotted cap and should this be changed? I think our home inspector told us it was illegal to have a slotted cap. Is it hard to remove this cap and where do we buy a new cap? Should we have our main sewer line snaked in case the slots let all kinds of dirt and sediment into our line?