Rectangular type single seal（double） manhole cove

PRODUCT INFORMATION Ductile iron square manhole cover Raw material: ductile iron QT500-7 Grade: D400 or used in the carriageway of roads Clear opening: 300*300/400*400/500*500/600*600/700*700/800*800/900*900/1000*1000/1100*1100mm Character: single seal, with closed key hole, cut-corner design, with kitemark Specification A15, B125, C250, D400, E600, F900 Shape double triangle, round, square, rectangular, octagonal types & etc. Surface Treatment bitumen, epoxy paint and water