Hedstrom Environmental septic lids are designed to eliminate riser systems. They are offered in 18- and 24-inch lids and adapter plates that are retrofit for standard corrugated I.D. drainpipe. The square-to-round adapter plate allows for quick conversions of tank risers to corrugated pipe. They are rotationally molded for strength with UV inhibitors to protect against color fade. Lids can be standard, foam-filled or sand-filled for additional strength. A gasket and safety screws are standard, along with optional custom nameplates displaying your company name and phone number. Safety nets are available upon request. 855-556-6755; www.hedstromenvironmental.com.