Duff offers the widest selection of products in our industry. From plumbing, heating and industrial supplies, to pumps, steam specialties and water treatment equipment, no one in the Philadelphia area equals our vast product line. Duff provides unsurpassed technical ability, with full time experts devoted to their specific fields. Emergency service is available 24 hours a day, 365 days a year. Duff is family owned and managed, an owner is always available to meet or talk with you, and all of this is brought to you at competitive prices!