Wall Liners

Predl’s polypropylene Wall Liners (Corprotect) protect the inner surface of the manhole riser from corrosion and water infiltration. Riser joints are capped with a PP strip and extrusion welded for a watertight seal. Predl Wall Liners are made of tough wastewater-resistant polypropylene. The low thermal shrinkage of polypropylene and 13mm anchors ensures a permanent and durable mechanical bond with the concrete. Wall Liners are produced for standard riser sections in 1′ (305mm), 2′ (610mm), 3′ (915mm) and 4′ (1.22M) heights for 42″ (1.07M), 48″ (1.22M), 54″ (1.37M), 60″ (1.52M) and 72″ (1.83M) diameter manholes according to ASTM C478 specifications. Predl Systems can manufacture custom sizes to virtually any dimension upon request.

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or DWG drawings in the Designer Login.


5B.PDF - Predl Systems Lined Concentric Flat Top Manhole Lid with Telescopic Liner, FRP/PP-R Turnback Joints w/Cap Strips & Two Butyl Sealant Strips


10A.PDF - Telescopic Access Ring Detail for Eccentric Cone, Turnback Joint, Fully Lined Precast 48" Manhole


1DD.PDF - Riser Section with Ladder Rungs and Cored for Inside Drop


4B.PDF - FRP Base Liner with PP-R Fiber Backed Transition Strip Detail