In 2015, GreenSeam pipe and fittings products branched off as a new division of DMI Companies called GreenSeam Industries (GSI).

GSI is a manufacturer of commercial Pipe and Fittings for the HVAC market. GSI’s mission is to be the market leader in product consistency, service, and innovation for low-pressure and medium-pressure duct systems. The organization has been supplying these products to markets from Maine to Florida and as far west as Kansas since 1998. The company has grown year over year by partnering with DMI’s distribution partners throughout the markets which it serves.


GSI has continually improved its revolutionary product line over the past 14 years. Tight product tolerances and exceptional manufacturing consistency is critically important when manufacturing GSI’s products. Loose tolerances or inconsistent product will result in problems during assembly and inconsistent performance. The consistency of GSI’s products and extremely tight manufacturing specifications are far beyond other snap-lock pipe and fittings manufacturers in our industry.


Our products are Union Made in the USA at our manufacturing facilities in Western Pennsylvania and Eastern Oklahoma with an additional warehouse in Lodi, CA. This multi-regional approach allows us to efficiently supply our products to our distribution network nationwide. Our Sales and Technical Support staff are housed at our corporate office in Charleroi, PA, 7 miles from our manufacturing facility.


GSI offers a full line of factory sealed snap-lock pipe and fittings