
Chicago Coupling — Chicago Hose Couplings
Chicago Couplings 1 inch and under have a 2-lug head design that mates with any 2-lug coupling regardless of hose or thread diameter. All couplings over 1 inch have a 4-lug design that interchanges between all 4 lug sizes. If you have a coupling larger than 1 inch with a 2-lug design, it is probably a sandblast coupling or an interchange from overseas. See Chicago …