supply of 660mm length air brake hose coupling for brake pipe , 660mm length air brake hose coupling for brake pipe drg no. rdso sk.73547, a lt.14, specification. appendix-f of spec:02-abr-02, amendt. no. 4 of sep 2016. special conditio n: 1)ensure that the plastic dummy cap shall be in red color with thickness 3.5mm to 4 m m. 2) the hose nipple edges and surface shall be buffed to provide burr free smooth surface. 3) a plastic film shall be provided at nipple-hose interface to prevent direct metal rubber contact [ warranty perio d: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted : max 8 lacs ] ]