waterproof belt 1Gray putty-like gel, 2weather resistant, anti-aging, 3 anti-leaking, erosion resistant, PN (BW) waterstop strip is ... level.Characteristics: Gray putty-like gel, weather resistant, anti-aging, anti-leaking, erosion resistant, simple operation amd low cost etc. ... (BW) waterstop strip is a kind of newest, best anti-seeping material used in underground construction works, waters, traffic ...