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