supply of pipe 20 n.b with socket & flange., air brake pipe 20 n.b, pipe 32 n.b with socket, air brake pipe 20 n.b, , air brake pipe 20 n.b with socket & flange., pipe 20 n.b. with socket & flange. drawing no.: rdso, s drg. no. wd-80007-s-11, alt. 12 , item no. 5 fitted with item nos. 15 & 16 . material and specification : as per drawing and conforming to rdsos spec. no. 04-abr- 2019 ( rev 02 of dec 2019 ) . [ warranty period: 30 months after the date of delivery ] , air brake pipe 20 n.b. with socket & flange ( special ) .drawing no.: rdso, s drg. no. wd- 80007-s-11, alt. 12 , item no. 8 fitted with item nos. 15 to 18. material and specification : as per drawing and conforming to rdso, s spec. no. 04-abr- 2019 ( rev 02 of dec 2019 ) . [ warranty period: 30 months after the date of delivery ] , pipe 32 n.b. with sockets flanges & fixed flanges ( welded assembly ) for freight stock drawing no. : rdso, s drg. no. wd-80007-s-11, alt.12 , item no. 3, fitted with item nos. 12, 13 & 14. material and specification : as per drawing and conforming to rdso, s spec. no. 04-abr- 2019 ( rev 02 of dec 2019 ) . [ warranty period: 30 months after the date of delivery ] , air brake pipe 20 n.b. with socket & flange for boxnhl wagon. drawing no. : rdso, s drg. no. wd-08008-s-11, alt. 6 , item no. 9 fitted with item no. 14 & 15. material and specification : as per drawing and conforming to rdso, s spec. no. 04-abr- 2019 ( rev 02 of dec 2019 ) or latest. [ warranty period: 30 months after the date of delivery ] , air brake pipe 20 n.b. with socket & flange for boxnhl wagon. drawing no.: rdso, s drg. no. wd-08008-s-11, alt. 6 , item no.10 fitted with item nos. 14 to 17. material and specification : as per drawing and conforming to rdso, s spec. no. 04-abr- 2019 ( rev 02 of dec 2019 ) . [ warranty period: 30 months after the date of delivery ]