20mm Galvansied PVC Coated Flexible Conduit id 17mm od 21mm supplied in 30m coils. Colour black. Construction Internal single metal clutch manufactactured from galvanised sheet steel with thin wall PVC oversheath. Temperature rating -15 to +80 C. Protection rating IP55. Flammability to CEI 23-14/V-1971 with 10 second resistance. Resistance definition Class 4 Heavy up to 2400 newtons. Mechanical tensile strength Class 4 heavy up to 1500 newtons.. 30m in length.