Tender For corrigendum : supply of gear type coupling , flexiblecoupling set contains five spares , 3by 4 inch type flexiblepipecoupling , d type flexible elbow 90 degree for 1 point 1 by 4 inch dia pipe , d type flexible elbow 90 degree for 1 by 2 inch dia pipe , d type flexiblecoupling 1 inch , d type flexiblecoupling 3 by 4inch , flexiblecoupling drum