This ring accepts both 20’’ and 24’’ risers and gives you great flexibility no matter what size your opening may be. Polylok has one of the largest adapter rings on the market allowing you to cover up to a 25’’ square opening or a 27’’ round opening. In order to put septic tank risers onto your septic tank, you need an adapter ring. section of the round manhole riser is given by the equation: Where: s unit compressive stress in the ring (pounds per square foot) p total lateral earth and hydrostatic pressure (pounds per square foot) D diameter of the manhole (feet) t thickness of the manhole wall (feet) t must be a minimum of 1/12 the largest diameter riser section. The lids are structurally supported on the bottom which also allows them to be relatively flat, instead of domed shaped like many other products on the market. The Polylok lids come with pre-installed handles that allow you to easily remove the lid any time you want to access the system. The septic tank access lid on a riser system is one of the most important components, because it is what you see in your yard and also what you have to remove every time the system is pumped or maintained. The Polylok products will have no issues in frost areas because they are completely smooth on the outside! LOW PROFILE RISER LIDS WITH HANDLES When the ground freezes and thaws it expands and contracts and products with structural support on the outside of the riser can actually be lifted from the tank causing damage to the riser and the seal. These internal structural ribs allow the outside of the riser to be smooth, this is important because of the freezing and thawing of the ground in many areas. A septic tank riser is an important component of many home septic systems. The Polylok risers have structural ribs internally around each riser section which give them great strength and allow them to hold their shape with the pressure of soil being pushed against them once the hole is backfilled. The reasons are many, but here are the most important: INTERNAL STRUCTURAL RIBS Our Polylok risers are simply the best your money can buy. There are many different types and styles of risers for septic tanks on the market today.
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