FPI PolyLock is an extruded HDPE E-shaped strip for geomembrane attachment. FPI PolyLock is a rugged, durable HDPE profile that can be inserted into wet concrete, leaving the welding surface exposed upon curing of the concrete. The strip is permanently imbeded through its E-profile that mechanically anchors itself to the concrete. This provides a welding surface which is high-strength and durable. When properly installed and utilized with a geomembrane, FPI PolyLock provides a good barrier to leakage. It is the most cost effective cast-in-place mechanical anchor system for HDPE.