supply of sealing ring and sealing ring for manhole cover , sealing ring for manhole cover for btpn wagon to irs drawing no. w/tf-21 69 alt.no 1 or latest [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitt ed: max 8 lacs ] ] , sealing ring to rdso drg.no.-wd- 86081-s-61, item no. 21, alt.-14 spec no.rub ber is:4388. note: section of the sealing ring and requirements shall be as per drg.no w/tf-2171 wit h mean dia of 150 mm and dim 11 mm instead of 130 mm and 10 mm respectively [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitt ed: max 8 lacs ] ]