Manhole covers are required where utilities such as tap water, telecommunications, electricity, gas, heat, fire, sanitation and so on. Bike lane ,sidewalk, Runway need install our Composite Pit cover sometimes.The Loading capacity of the cover usually use A15, 2.5 Tons, 5 Tons, 10Tons, B125,20Tons and C250. Polymer matrix composites are mainly used for manhole cover and Drainage Gratings. If The airport …