• Easily removable knock-outs simplify pipe placement and reduce installation time
• Knock-out retainers align removed knockouts in place above the pipe to help keep dirt out during backfill
• Corrugated sides provide strength both before and after knock-outs are removed
• The shovel access slot on the body allows for easy lid removal
• Beveled lid edges help prevent damage to lids from lawn equipment
• Bolt hole knockout in the lid keeps insects out of the box when the bolt is not used
• Interlocking bottoms allow boxes to mate securely together bottom-to-bottom for deep installations