supply of sealing o ring , inside dia=20 mm, cross section dia = 3.55 mm. todrawing/specification : size code : 35502000 as per is : 9975 (part-1)/1981 table - 1 and material class -a as per is : 9975 (part-2) , appendix-a (i.e. nitrile butadine) , sealing o ring , inside dia=20 mm, cross section dia = 3.55 mm. to drawing/specifica tion : size code : 35502000 as per is : 9975 (part-1)/1981 table - 1 and material class-a as per is : 9 975 (part-2) , appendix-a (i.e. nitrile butadine) [ warranty period: 30 months after the date of delive ry ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitt ed: max 8 lacs ] ]