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Supplying Plumbing, Heating, Pumps, Water Treatment Equipment, and more to the Philadelphia Region. Duff Company was founded in 1947 by Richard "Dick" Duffine. Today, Duff Co. is run by Dick's son Geoff, and grandson Alex, along with Geoff's son-in-law, Michael Genkin. Together, The Duff Co. family is dedicated to growing its services while maintaining the superior level of quality that has become its hallmark.

We offer the widest product selection around - from plumbing, heating and industrial supplies to pumps, steam specialties, multi-family housing supplies, water treatment equipment, and more.
Services
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.
Submersible, effluent, chemical feed, booster, circulator and well pumps - whatever your situation demands, Duff can supply the pump and the accessories. We offer a wide range of pumps for a wide range of applications, whether for residential, commercial or industrial uses. Duff offers a full range of pumps, pumping systems and components to fit your, or your customer's, needs.
For groundwater and irrigation applications, Duff supplies pumps, systems and accessories for a reliable supply of fresh water and increased crop productivity-to keep your customers satisfied. We are also the experts in environmental well pumps and motors. A reliable supply of fresh water is a basic necessity for all homeowners, especially for those whose source is a private groundwater well.
From raw water intake and drinking water treatment to water distribution, flood control and wastewater treatment, Duff is a full-line supplier of reliable products for each application within the water cycle. The experts at Duff can help you cover all eventualities, from large-scale, fully-customized pumping stations to complete prefabricated submersible pumping stations; from large axial and mixed-flow pumps that can cope with moving vast flows of surface or storm water at low head to sewage grinder pumps for pressurized systems with small amounts of water and small lifting stations for transporting effluent away from buildings-in addition to all varieties of sump, sewage and effluent pumps.
Reviews (10)
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Mike Eachus
Oct 24, 2021
Call Duff Supply ordered parts, went to pick up parts, parts for their waiting for me, no hassle
Shane Power
May 05, 2021
What a great place to grab plumbing supplies. Staff is excellent in knowledge and customer service. Great experience. Good quality materials good pricing.
Daniel Vieldhouse
Dec 18, 2020
Very knowledgeable and friendly. Have no problem going the extra few minutes to get you what you need. Or point you in the direction you need to go.
Karen Pflug-Felder
Nov 08, 2020
Employees are very knowledgeable. They have a large stock as well.
Scott Schafer
Mar 27, 2020
Ignorant! I mean we should have known that a company that is established in Norristown would be full of ignorant employees. We understand the gravity on the Covid 19 situation but we called and they said They were open but when we got there we were greeted with an employee that was mean and told us to go away in not so nice words. U just lost very good contractors
Ato Mic Atomic
Apr 13, 2019
Very helpful staff, unfortunately the products are marked up more than double. If I wait 4 days I can buy the same thing online for more than 60% off. Otherwise, great to have a family run business
Tom Boward
May 17, 2018
I needed a fitting for an emergency plumbing repair in my home and I couldn't find what I needed at the local Home Depot, so I called Duff. The guy on the phone was very friendly and told me that he was closed, but would still be around if I wanted to run over - just knock on the door. I was really impressed with this level of customer service and was thrilled they could help me at such short notice.

When I got there, he produced the fitting (a no-hub 1 1/4 rubber union that attaches with two hose clamps) and told me that it was $39.85. I was absolutely blown away by this markup. I did some research when I got home and found that this is a $6 part everywhere else. I have no idea why it was seven times more expensive at Duff, but he didn't ring the sale or issue a receipt (said the register was closed for the day), so I can't help but feel like I was taken advantage of.

It's hard to say what the final truth is here. On one hand, the guy was willing to wait around and genuinely seemed to want to help me, for which I am very grateful. On the other hand, I really feel like I was ripped of pretty hard. I guess in the final analysis, I should have declined to pay it and let my plumbing emergency sit for another few days, so the fault is mostly mine. Either way, I won't be returning to Duff and I would suggest the average home-owner not use them as a primary source for his or her plumbing needs.
Harlen King
Apr 02, 2018
I wanted a pressure tank-wx250,t he counter worker put a wx205 tank in my car. Now I have to waste time & gas to correct this transaction. I felt I should have a discount.
Mitchellconrem Fresh Fresh
Jan 26, 2018
Duff company is a plumbing supply house dustrial commercial and household they offer water treatment vanity cabinets One-Stop shopping all your plumbing needs I usually deal with salesperson name woodie excellent customer service very very knowledgeable if you have a problem he can usually answer it with no problem a family-owned business
James Chou
May 16, 2017
Went there 10 min before close on Saturday. Found the faucet part I was unable to locate @homedepot. These people are very knowledgeable. If you have plumbing needs or need maybe old parts, go to this place directly and skip the big box stores.