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  • Why GSI
  • Products
  • Where to Buy
  • News
  • Resources
  • Contact
Products
  • HVAC Pipe

    GSI Snap-Lock pipe is an easy-to-use, easy-to-ship, ductwork solution for the low-pressure side of an HVAC system.  Available with or without our patented GreenSeam® factory sealed technology.  Yellow Union Label manufacturing is standard on these products.

  • HETO High Efficiency Take Offs

    GSI’s most versatile factory sealed fittings, combining efficient use of space and optimal airflow. Our HETOS are available in three styles to suit virtually every installation need. Yellow Union Label manufacturing is standard on these products.

  • Conicals

    GSI’s traditional factory sealed round tapered take-off with a large base creating less static and total pressure drop than other fittings. Our Conicals are available in two installation styles, spin-in and press-on. Yellow Union Label manufacturing is standard on these products.

  • Duct Collars

    GSI’s most cost-effective factory sealed fitting for beginning a new duct run from the trunk line. Available in three installation styles and multiple lengths to suit virtually every installation need or budget. Yellow Union Label manufacturing is standard on these products.

  • Couplers

    Designed to join two straight duct runs together. GSI couplers are factory sealed so no external sealant is required at this connection and are available in two sizes, 6 and 8 inch to accommodate multiple installation needs. Yellow Union Label manufacturing is standard on these products.

  • In-Line Sleeve Dampers

    When additional air balancing is required, GSI’s in-line sleeve damper has been specifically engineered to work with our GreenSeam Plus pipe. The in-line damper provides the best way to keep the system factory sealed and add supplemental system air balancing. Yellow Union Label manufacturing is standard on these products.

  • Tee-Joints

    Designed to branch a single duct run into two at a 90-degree angle. GSI tee joints are available in two variations, factory sealed and unsealed. Yellow Union Label manufacturing is standard on these products.

  • Adjustable Pipe Elbows

    Adjustable pipe elbows, also known as duct elbows, are the most efficient way turn a straight run of duct. GSI pipe elbows are available in two styles, 45 and 90 degree to accommodate multiple installation needs. Yellow Union Label manufacturing is standard on these products.

  • Saddle Taps

    GSI’s factory sealed take-off for round duct. Manufactured with a curved one-inch flange and peel and stick gasket, our saddle tap installs easily on round duct without the need for external sealing. Yellow Union Label manufacturing is standard on these products.

  • Reducers and End Caps

    The perfect accessories for any low-pressure duct system. GSI reducers and end caps are factory sealed and require no external sealing when paired with GreenSeam Plus pipe. Yellow Union Label manufacturing is standard on these products.

  • Products Overview
  • HVAC Pipe
    • GreenSeam® Plus Snap-Lock Pipe
    • Reeves Lock Pipe
  • HETO High Efficiency Take Offs
    • Tapered High Efficiency Takeoff
    • Straight-Sided High Efficiency Takeoff
    • Center High Efficiency Takeoff
  • Conicals
    • Press On Conical
    • Spin In Conical
  • Saddle Taps
    • Saddle Tap
  • Duct Collars
    • 6″ Long Press-on Collar
    • 3″ Long Tabbed Collar
    • 6″ Long Tabbed Start Collar
    • 3″ Long Spin-in Collar
    • 6″ Long Spin-in Collar
  • Couplers
    • 6″ Long Coupler
    • 8″ Long Coupler
  • In-Line Sleeve Dampers
    • 6″ In-Line Sleeve Damper
  • Tee-Joints
    • Free Flow Tee Joint
  • Adjustable Pipe Elbows
    • 90° Adjustable Elbow
    • 45° Adjustable Elbow
  • Reducers and End Caps
    • Reducers
    • End Caps

Corporate Office

210 Fifth Street
Charleroi, PA 15022

Phone: (866) 285 5222

Fax: (724) 258 5494

Contact Us

Manufacturing Locations

1502 Industrial Drive
E. Monongahela, PA 15063

Phone: (724) 258 0500

300 SE 15th Street
Wagoner, OK 74467

Phone: (918) 485 1700

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