Large Flat Septic Tank Riser Replacement Lid Cover 24"Large Flat Septic Tank Riser Replacement Lid Cover 24" Easily access your home's septic tank by replacing concrete covers with our polypropylene septic tank riser lid. By using our premium septic tank lid, you can properly maintain your septic tank without the extra hassle of digging into soil or cement. With its versatile design, the septic riser comes with ridges in its interior that enable you to fill it with cement. This way, you can add extra