Trade size 16,20,25,32,40,50 Material:carbon steel Threading both ends of conduit With one coupling and plastic cap

standard:BS4568_1970 

trade size:16,20,25,32,40,50,60,75.5,88.5,114

all sizes are finished in the length of 3750mm or according to your requirement

material:carbon steel

surface finish:(PG)pregalvanized,(HDG)hot-dip galvanized

thrade:15teeth per 1

Diamension(mm)	Outside diamenter(mm)		Wall thickness(mm)
	minimum	maxmum
16	15.7	16	1.4(+/-0.10)
20	19.7	20	1.6(+/-0.15)
25	24.6	25	1.6(+/-0.15)
32	31.6	32	1.6(+/-0.15)
40	39.5	40	1.6(+/-0.15)
50	49.5	50	1.6(+/-0.15)

There are class 3 conduit deliver in a length of 3.8m or produce according your requirement

BS4568