▁rival ▁Union . ▁In ▁August ▁ 1 9 0 6 , ▁members ▁of ▁the ▁se cess ion ist ▁Union ▁realized ▁the ▁fut ility ▁of ▁further ▁rival ry ▁and ▁agreed ▁to ▁affili ate ▁with ▁the ▁United ▁Association . ▁ ▁From ▁ 1 8 9 8 ▁to ▁ 1 9 1 4 , ▁the ▁United ▁Association ▁went ▁through ▁several ▁phases ▁of ▁a ▁struggle ▁with ▁the ▁International ▁Association ▁of ▁Ste am ▁and ▁Hot ▁Water ▁F it ters ▁and ▁Hel pers , ▁a ▁prolong ed ▁and ▁sometimes ▁bitter ▁dispute ▁both ▁over ▁juris diction ▁over ▁a ▁craft ▁( ste am f itting ) ▁and ▁work ▁assign ments ▁( pl um bers ▁vs . ▁steam fit ters ). ▁The ▁conflict ▁affected ▁other ▁building ▁tr ades ▁when ▁walk outs ▁by ▁the ▁rival ▁steam f itting ▁organizations , ▁as ▁a ▁result ▁of ▁their ▁juris dict ional ▁dispute , ▁led ▁to ▁work ▁sto pp ages ▁by ▁other ▁craft s . ▁ ▁The ▁strength ▁of ▁the ▁United ▁Association , ▁and ▁favor able ▁r ul ings ▁by ▁the ▁American ▁Federation ▁of ▁Labor , ▁including ▁the ▁rev ocation ▁of ▁the ▁International ▁Association ' s ▁char ter ▁in ▁ 1 9 1 2 , ▁ended ▁this ▁juris dict ional ▁battle , ▁but ▁other ▁juris dict ional ▁issues ▁would ▁continue ▁to ▁challenge ▁the ▁Union . ▁ ▁New ▁disput es ▁arose ▁over ▁the ▁construction ▁of ▁chemical ▁plants ▁and ▁other ▁manufact uring ▁and ▁service ▁establish ments ▁that ▁required ▁extensive ▁pip ing ▁systems . ▁Lar ge ▁volumes ▁of ▁newer ▁types ▁of ▁pipe f itting ▁installation ▁in ▁the ▁shift ▁from ▁World