Steel Tube Galvanised Isi Mark In Random Length Of 4 To 7 Mts. Screwed At Both Ends Soc Keted At One End And Other End Protected With Plastic Protector, Nominal Bore 20 Mm Medium Class, Socket Shall Also Be Isi Marked." Specn: Material Spec : Is-1239 (Pt-I) : 2004 For Tube, Is:1239 (Pt.2): 2 011 For Socket And Is:554:1999 For Pipe Thread [ Warranty Period: 30 Months After The Date Of Deliv Ery ] ]