Tender For corrigendum : supply of main odorizer units : : - 1000 wl odorizer unit design and engineering and manufacturing and testing and supply of automatic injection type odorizer unit as per tender documents and sor , suitable odorant absorber as per tender documents and sor , odorant for natural gas as per tender documents and sor , refilling of odorant in main tank for three years period as per tender documents and sor , a suitable portable odorant concentration-measuring device as per tender documents and sor , comprhensive annual maintenance contract as per above job specification first year after warranty period , comprhensive annual maintenance contract as per above second year after warranty period , comprhensive annual maintenance contract as per above job specification third year after warranty period