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The patented new flue cap is designed to improve air flow and eliminate excessive moisture and debris that can rust or damage high efficiency gas furnaces, tankless hot water tanks, plumbing or other PVC vented installations.


  • Faster and easier to install than double 90° elbows (P-Trap)
  • Superior design, function and price to conventional concentric vents.
  • Patent # 6,978,803
  • Resistant to heat, cold, precipitation or UV radiation
  • Protects furnace motor and interior from moisture, debris, and pests.
  • Promotes unrestricted air flow of both Intake, and Vent flue
  • OEM recommended by Amana®, Bosch® and Goodman® for use in 90% AFUE heating applications
  • Precisely fits 1½", 2", and 3" PVC pipe.
  • Distributed exclusively by SUPCO®
  • SUPCO® TradeFox™ Approved for being a Technician-Invented product
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Dimensions: 5-1/2" O.D. x 3-5/8" High
Material: GELOY CR7520 acrylic-styrene-acrylonitrile (ASA) resin
For use on all PVC vented, high efficiency applications
Works perfectly in either vertical or horizontal flue pipe installations
SDS Product Sheets Cross Reference Information
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Manuals Application Sheets Software
no entry ECAP321_app_001.pdf
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No Cross Reference Available

No Accessories Available

Will this fit on 3" PVC pipe?: Yes, ECAP321 can accommodate 1-1/2", 2", and 3" PVC pipe.
Is ECAP321 paintable?: PVC can be painted but it has to be prepared correctly and it needs to be painted with paints that are formulated for PVC.