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Hardcast Duct Seal 321 - Fiber Reinforced Duct Sealant

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  • Hardcast Duct Seal 321 Fiber Reinforced Duct Sealant in 1 Gallon Pail
  • Pookie being applied to a sheet metal duct joint
  • Image 3
RRP: $21.00
$17.99 (You save $3.01)
Unit Of Measure:

 Product Description

CCWI - 181 is a versatile, all purpose, high velocity duct sealant for use on all types of metal duct, glass fiber duct board, and flex duct, as well as duct fabric and flexible tubing run outs. Hardcast Duct-Seal 321 incorporates a built-in fiber reinforcement for exceptional strength, with UV inhibitors for outdoor use.  Duct Seal 321 is commonly referred to as "Pookie" or "Duct Butter" by HVAC tradesmen around the country.  If you are looking for "Pookie", Hardcast duct sealant is the brand to you are looking for!

Hardcast Duct-Seal 321 is UL 181 B-M Listed -Passes ASTM D-2202, ASTM C-731.  USDA, EPA and FDA Approved.  LEED compliant SCAQMD Rule 1168.  -City of Los Angeles Approval RR #8069


* LEED EQ Credit 4.1
* Seals all types of HVAC Systems
* Rated for Indoor or Outdoor use
* Fiber reinforced for additional strength
* Rated for high velocity HVAC Systems
* Has excellent mold and mildew resistance

Sold per 1 Gallon Pails

*Note: Product color is Gray

 Product Reviews

  1. Always a great choice!

    Posted by Robert on 7th Apr 2015

    I've been using this for years. I've had the privilege of working with it commercially on the job when I started in this industry and now with my own business and personal jobs. It spreads on great, has excellent adherence, perfect consistency and fiber re-enforced. It's a much better quality than anything you will find at your local big box hardware stores. I highly recommend this product.

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