Leemco LPP-1000 10" Compression Restraint. Leemco restraints have blunt cast serrations which are specifically designed for PVC or HDPE plastic pipe. These non-machined serrations will not damage the plastic pipe surface and have a fused epoxy finish to protect against corrosive soil conditions. With the Leemco system, joint connections can be made in the shortest possible time. There is no need to wait for concrete trucks to arrive or long waits for concrete to cure. The system can be pressurized as soon as the joints are tightened. The Leemco Joint Restraints are designed to get a system in operation in the least amount of time and effort.