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Tender For corrigendum : supply of circulating head 5 1/2" btc pin 4 1/2" if box, 19.5# , circulating head 7" btc pin 29x 4 1/2" if box , rotary right hand substitute (crossover) 6 5/8 rb 4 if , cross over 4-1/2" if 19.5ppf box 13-3/8" btc 68ppf , cross over 4-1/2" if 19.5ppf box 9-5/8" btc 47 ppf pin work pressure-5m circulating head