Polylok 3008-RC Septic Tank Riser Cover, 24-Inch, Green NOTE: THIS ITEM WILL ONLY FIT POLYLOK RISERS! The Polylok 24 3008-RC solid riser cover was designed for use with the 3008 and 3008-R12 risers This product will not fit competitor brand risers or competitor corrugated pipe risers. This product will not fit directly on your septic tank. You must have a Polylok Riser to use this product.