A & E Services

D&D Instruments is a Minnesota based company specialize in repairing and rebuilding auto and international instrument clusters. We repair most foreign and domestic models. We also carry Expello Drain Valves, 5” Kenworth Speedometer, Stark Air Dryers, and many other switches, gauges and parts.

Formed in 1909, Duncan Co. is a manufacturer of a variety of valves that provides various related services. Based in Minneapolis, Minn., the firm is one of the leading suppliers of abrasives, cutting tools and many other products. The company offers its vast customer base an array of metal removal products, such as abrasives and brushes, cutting tools carbide and HSS, inventory control systems, maintenance and miscellaneous and many more. Duncan Co. provides a range of value-added services, including technical support, valve actuation, customized ordering and customized processing, among others.

Receive Quality Service from a Trusted Company With Zahl-Petroleum Maintenance Co., you're in the right hands. Quality workmanship, service, and parts are our top priorities. We aim to emulate that with every installation, sales call, and service ap