Polylok 20" Round Septic Tank To Riser Adapter Ring

This Polylok Round Tank Adapter Ring is for 20'' round or smaller openings. This ring allows you to mount the Polylok risers to a concrete or plastic septic tank. This may also be used to convert other brands of risers to the Polylok system. Once the adapter ring is mounted and seals, any combination of Polylok 20'' diameter risers or lids will attach directly to this ring.