Trusted Supplier of Specialty Plumbing and Heating Equipment Since 1947

While Duff began in 1947 as a supplier of specialty plumbing items, today we stock a vast inventory of products, materials and tools for facilities, maintenance and engineering departments of offices buildings, school districts, colleges & universities, apartments & multifamily housing, hospitals, nursing homes, factories and many, many more. We are proud to serve plumbers and mechanical contractors all over the Philadelphia area with the highest quality plumbing and heating supplies from the world’s most trusted manufacturers.

Parts Guru

We specialize in high-demand and high-use facilities and institutions. If it’s broken or busted, it’s likely we’ll have a replacement or solution; if you can’t identify it or don’t know what it’s called, just ask our Parts GuruThis highly sophisticated algorithmic paragon of industry expertise combines more than two centuries’ worth of Duff knowledge. Just ask!

Duff Differs

The Duff Difference means we are committed to the widest product selection and deepest inventory, focused on professional maintenance and facilities departments. In addition to pipe, valves and fittings, china, faucets, flushometers, water coolers–the types of products that keep a facility running everyday–we also stock that oddball item you didn’t even know existed.  We see our job as making your job easier.  Duff team members are available and on-call for emergency service, 24 hours a day, 365 days a year.

We take our business as serious as yours. Our team, where the average tenure exceeds 20 years, enjoys the personal relationships with our customers. Duff’s reputation for a broad product line, excellent service, fast delivery and strong family values makes Duff differ from other companies.

Commercial & Industrial Product Lines:

  • Pipe, Valves, Fittings
    • Black steel, galvanized, cast iron, plastics, copper, copper press, stainless steel, and many other materials; steel pipe, soil pipe, copper tubing, chemical waste, PVC; dresser couplings, clamps, repair couplings; fasteners & hangers, gaskets; butterfly, check, ball, gate & blow-down valves; PVC, iron, steel, bronze, stainless steel, epoxy-coated valves; gear-operated, actuated, solenoid valves.
  • Heating, Steam Specialties and Controls
    • Steam traps, regulators, and relief valves; boiler trim, gauges & thermometers; heat exchangers, coils and tube bundles; circulator pumps; storage and pressurized tanks; water heaters; condensate pumps and receivers; unit heaters.
  • Plumbing
    • Commercial, institutional and residential china, tubs and showers; emergency eye washes, showers and other emergency equipment; manual and electronic sensor faucets and faucet repair parts; commercial flush valves and repair parts, retro-kits and other water-saving solutions; garbage disposals and other kitchen equipment; hand showers; stainless steel sinks, tubular and other supply needs and valves; toilet seats, toilet jacks, bariatric accessories; washroom accessories, including partitions, grab bars and hand dryers; water coolers and fountains, bottle fillers.
  • Pumps & Pump Supplies
    • Electric motors; hose and fittings in rubber, PVC, vinyl, braided, poly suction, discharge, layflat, chemical wash-down, steam, oil; pressure to 3,000 psi; meters and totalizers in brass, iron, stainless and other materials; pump accessories, including switches, check valves, foot valves, hydrants, gauges, barbed fittings, strainers and pump connections; centrifugal, pressure-boosting, chemical feed, sump, sewage & effluent, grinder, circulator, base-mounted, skid-mounted, end-suction and split case pumps.
  • Tools
    • Hand tools, power tools, freeze kits, torches, specialty tools; brushes & abrasives; cements and cleaners; plumbing chemicals, cutting oils, acids, wax rings, spray products; drain cleaning tools, cables, cameras, augers, tapes and other accessories.
  • Property Management Supplies
    • Cabinets, countertops and vanities; door and window hardware, bath fixtures and parts, electrical supplies, cleaning supplies and tools.
  • Custom Fabrication
    • Solid surface countertops, stainless steel cabinets, and custom welding; black and extra heavy steel, stainless steel, and other materials; custom manufactured strainers, baskets, doors, panels and other parts; steam specialties, including flash tanks, quench tanks, skidded water treatment systems and equipment, and pump components; spool pieces, manifolds and headers; various custom-made receivers and tanks.

Line CardDuff line card-1

Click on the image to the right, so you can see for yourself:  Duff offers the broadest product selection–and, more importantly–what you’re looking for, when you need it, so you can get the job done.  If you don’t see it, ask our parts guru or call or email us today.


For a more in-depth look at our stock, or to search through our full catalog of products, click on the “Search Parts Catalog” and “Search Water Treatment Catalog” buttons.  Our catalog is a constantly evolving work-in-progress.  We published our newest version in 2018, so please let us know if you’d like one! If you have any questions, call or email us.