Asalin kwata-kwata na murɗa haɗin bututun iska na duniya a cikin babban tiyo 4-lug jerin. 4-lug coupling head zai musanya a cikin 1-1/4 ta 2 inch masu girma dabam.
l 4-Lug Universal Chicago Coupling
l Ƙarfe mai yuwuwa kawai (taron tagulla ya daina)
l Girman da aka jera shine diamita na tiyo (ciki)
l Shigar ta amfani da ƙulle-ƙulle na bututun ƙarfe
