Manhole flange

FLANGEManhole flange according to the division it can be divided into

through-hole, three holes, four holes and oblique through-hole man, specifically

in Table 1 below. Among them, oblique through the hole is divided into 15 °, 30

°, 45 °, 60 °, 75 ° total of five. The angle of each oblique through hole can be

applied within ± 7.5