Duncan Engineering Limited, formerly Schrader Duncan Limited, is a manufacturer and trader of tire tube valves and accessories, fluid power and automation products. The Company's segments are Automotive Tyres Valves & Accessories, and Fluid Power & Automation. The Fluid Power & Automation segment consists of pneumatic equipment and hydraulic products. Its fluid power and automation category consists of products, including pneumatic cylinders, hydraulic cylinders, pneumatic valves, air preparation units, positioners, pneumatic rotary actuators, tubing and fittings, pneumatic automation systems, valve automation systems and modular piping system. Its automotive category consists of products, including tire tube valves, such as passenger car valves; valve accessories, such as valve cores; valve extensions, such as mold tube connectors; garage and in-plant service, such as air chucks, and tubeless tire valves. Its manufacturing unit is located at Ranjangaon.