Glass-reinforced plastic (GRP) is a fiber reinforced polymer made of a plastic matrix reinforced by fine fibers of glass.The properties of GRP making is extremely versatile allowing for larger GRP buildings like: Housing,storage units,water meter box,manhole cover,outdoor flooring, roof, door,etc. ADVANTAGES OF GRP MANHOLE COVERS Non recyclable which makes it of no value, hence eliminate incentive for stealing. Resists weight for up to 40 …