Supply Of Double Walled Corrugated Pipe 6 Mtr. In Length, 120 Mm Outer Dia And 103 Mm Inner Dia, With One Suitable Coupler Conforming To Rdso Specification No. Rdso/spn/204/2011 Version 1.1 Amdt 1 Or Latest For Underground Cable Protection. Colour-orange. Inspection By The Representative Of Railway.warranty Upto 30 Month From Date Of Supply..