Hedstrom Plastics Septic Tank Covers are designed to eliminate costly riser systems. They are available in 18- and 24-inch lids, with square to round adapter plates made from strong polyethylene UV-protected material, along with safety nets. They are lightweight for easy installation and transportation. Lids can be sand- or foam-filled for additional strength. A gasket and safety screws come standard, along with optional nameplates displaying the installation company’s name and contact information. 888-434-5891; www.hedstrom.com.