Septic Tank Covers from Hedstrom Plastics are designed to eliminate riser systems. Lids come in 18- and 24-inch options and are made from polyethylene UV-protected material, yet are lightweight for easy installation and transportation. Lids can be filled with sand or foam for additional strength. Gasket and safety screws come standard, along with optional custom nameplates displaying a company name and phone number. 888/434-5891; www.hedstromplastics.com.