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Duncan Co (formerly GWS Supply) is your expert resource, we are a knowledgeable, reliable, competitively priced industrial distributor.

Duncan-Wisconsin  has a product offering of Valves, Fittings,Tubing, Actuators, Controls, Instrumentation, Filtration and Process Safety Products.   We can supply you with the following Key Product manufacturers:  SVF Flow, Cashco & VCI, Hoke, Gyrolok, Apollo, Yeary Controls-Sharktooth, Fairchild Regulators, TopLine, Rosedale, United Filtration, Circle Seal Controls, Circo Go Regulator, Palmer Wahl, Kayden, Quadbeam, Asco, ABZ, Champion Valve, Kelair, Rotork, Powell, P.B.V., Saunders, Leser, Taylor Valve, InLine Ball Valve, Aquamatic, Hayward,  Remote Control, US Valve, Lined Valve, Wika, YTC, Soldo, Hawk Measurement, BS&B Safety Systems, Parker Finite, BLX, Westlock, DFT, Keckley, Sentry Equipment, and more.

Please visit our Services page to learn how we can help you with Electronic and Instrumentation Repairs, Mechanical and Hydraulic along with Repair Service Warranty and much more!


Duncan Valve Automation Photo Gallery