supply of 660mm length air brake hose coupling for feed pipe drg no. wd-81027-s-01,alt.14 , 660mm length air brake hose coupling for feed pipe drg no. wd-81027-s-01,alt .14 specification no. appendix-f of spec.02-abr.02, amendt.no.4 of sep.2016.special condition : 1) ensure that the plastic dummy cap shall be in red colour with thickness 3.5 to 4 mm. 2) the hose nipple edges and surface shall be buffed to provide burr free smooth surface. 3) a plastic film s hall be provided at nipple-hoseinterface to prevent direct metal rubber contact [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted : max 8 lacs ] ]