BS4568 junction box 1.BS4568 1970 class 3,class 4 2.Thread both ... conduit 3.OEM service 4.24h on service BS4568 junction box class 4 and class 3 conduit's fittings are produced ... : 1-way, 2-way, 3-way, 4-way, Terminal Box, Intersection Box, Through Box, Tee Box, Angle Box. 2) Available sizes: 20mm and 25mm, 32mm. 3 ... .00φ50500-0.4±0.15±50.00 BS4568 Junction Box