supply of check valve assembly , check valve assembly. drawing no: rdsos drg. no. sketch - 98112, alt. nil, item nos. 1 to 10 in assembled condition. matl. & specn : rdsos spec. 02-abr / 02 with amend. 4 of sept. 201 6, appendix. i. uvam id : 3100389001 [ warranty period: 36 months after the date of delivery ] ] , isolating cock. drawing no: rdsos drg. no. sketch - 97002, alt. 2, item nos. 1 to 12 in assembled condition. matl. & specn : rdsos spec. 02 abr / 02 with amendment 4 of sept. 2016, ap pendix - i uvam id : 3100389009 [ warranty period: 36 months after the date of delivery ] ] , dirt collector complete [in assembled condition]. drawing no - rdso,s drg. no. wd-920 51-s-03, alt. 5. material and specification - as per drg. and conforming to rdsos spec. no. 02- abr- 0 2, amend. no 4 of sept. 2016 with appendix-e . uvam id :3100389004 [ warranty period: 36 month s after the date of delivery ] ]