Duff Company is a family-owned wholesaler and manufacturer founded in 1947, specializing in plumbing, heating, pumps, water treatment systems, and multi-family housing supplies. They offer machining and manufacturing services, custom water treatment system design, and distribute products for residential, commercial, and industrial markets.
Gold Seal-certified
NSF/ANSI Standard 53
WRAS approved
NSF53
Quality certification
Lancaster Water GroupFounded in Lancaster County in 1942, Lancaster Water Group makes American-crafted water treatment equipment for residential and commercial use. Four generations of the founding family continue to operate the company, which expanded from selling pumps into water treatment solutions in 1952 and maintains an on-site engineering team. Its Aqua-Technician seminars also provide technical training and certification for water-treatment professionals.LANCASTER, PA
J.C. Whitlam Manufacturing CompanySince its founding in 1900, J.C. Whitlam Manufacturing has remained an independent, family-owned Ohio business known for its long-standing role in the plumbing industry. Now operating under fifth-generation family involvement, the Wadsworth company applies its chemical-engineering experience to products used by plumbing and related trade professionals worldwide.WADSWORTH, OH
DMI Companies, IncFounded in 1978 as Ductmate Industries, DMI Companies, Inc. is a manufacturer of HVAC products and building automation systems serving contractors and builders worldwide. Its four manufacturing divisions produce union-made products, and the company is known for engineered duct systems and components. DMI operates manufacturing facilities in several states and also offers Airoverse building automation for commercial buildings.CHARLEROI, PA
Ashland Water GroupFamily-owned Ashland Water Group brings more than 35 years of manufacturing experience to the water industry from its Ashland, Ohio, home. The company is known for solution-based products that help move water for customers ranging from residential users to municipal organizations, with its brands built around practical service and dependable support.ASHLAND, OH