supply of 1 check valve as per clw drg. no 0/2/65/102 alt-2. each unit should be emboss/ engraved with makers name, month, year & batch no. of manufacturing at a conspicuous place.1 check valve as per clw drg. no 0/2/65/102 alt-2. each unit should be emboss/ engraved with makers name, month, year & batch no. of manufacturing at a conspicuous place.,1 check valve as per clw drg. no 0/2/65/102 alt-2. each unit should be emboss/ en graved with makers name, month, year & batch no. of manufacturing at a conspicuous p lace. [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]