Ну крышка люка запечатанный давление

1. Its made of QT400, 500-7, 25 characterized with no deformation, no cracking, which has passed the standard test of CT/T3012-1993 2. With the electrostatic spraying technique, its surface will be durably colorful personalized with anti-UV, water-proof, and anti-aging. Also, any professional picture, name and customer service phone can be designed according to our customers. 3 It is made of ductile iron 4 Sealed pressure well adopts advanced workmanship ,It is stronger to press ability 5 Can bear huge shock pressure , can satisfy construction demand more , 6 In the Meantime, bearing ability is stronger 7 The price of composite manhole cover is lower than stiplated standard cast iron ones 8 Light weight .the weight is 1/3 lighter than cast iron ones so that it is convenient to transport ,install ,rush repair ,construct easily