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Each riser section has a ring around the outside. In cold weather climates where frost heaves may occur,this <br /> ring needs to be removed.This should be done to each riser section before it is screwed in place. This can be done by <br /> running a knife between the ring and the riser. This will separate the two pieces so that the ring can be removed. <br /> Although the Polylok risers and covers are very strong, it should be noted that they are not rated for H-20 <br /> loading. We have had risers tested to accept a uniform load of 6,000 lbs.and covers center load tested at 2,500 lbs. <br /> Risers should not be buried more than 3 feet below grade. <br /> Polylok's Safety Screens should be used for installations near children and pets. Safety Screens act as a <br /> secondary layer of protection if the riser cover is damaged or removed.The screen fits in the upper most riser stack of <br /> our Polylok Risers and prevents entry into the septic tank. [https://www.youtube.com/watch?v=7hmR3-vOrWUJ <br /> THIS PRODUCT MUST BE INSTALLED IN ACCORDANCE WITH THE APPLICABLE INSTALLATION CODE BY A PERSON <br /> FAMILIAR WITH THE CONSTRUCTION AND OPERATION OF THE PRODUCT AND THE HAZARDS INVOLVED. <br /> POLYLOK EXCLUDES AND DISCLAIMS ALL WARRANTIES FOR THIS PRODUCT, EXPRESS OR IMPLIED, INCLUDING BUT NOT <br /> LIMITED TO THE IMPLIED WARRANTIES OR MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. <br /> P42LYAOCr-W <br /> TM <br /> Inc. <br /> Innovations in Precast,Drainage z; Zabel , <br /> &Wastewater Products A Division of Polylok Inc. <br /> 3 Fairfield Boulevard,Wallingford,Connecticut 06492 <br /> Office: 1-877-765-9565 Fax:203-284-8514 <br /> email:sales@polylok.com <br /> Web site:www.polylok.com <br />