通径            对应螺纹          允许电缆            最大外径

DN15            G1/2                   4分                     11mm

DN20            G3/4                   6分                     14mm

DN25            G1                      1寸                     20mm

DN32            G11/4                 1.2寸                  26mm

DN40            G11/2                 1.5寸                  32mm

DN50            G2                       2寸                    38mm

DN70            G21/2                  2.5寸                 48mm

DN80            G3                       3寸                    58mm

DN100          G4                       4寸                    70mm