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🔧 Seal smart, sound silent, and stay ahead of the HVAC game!
Hardcast’s 304156 1 Gallon Duct Seal 321 is a professional-grade, silicone-based duct sealant designed for durable, flexible sealing of HVAC ductwork. With a large 128 fl oz volume, it excels at blocking air leaks, reducing noise by securing sound-absorbing materials, and preventing pest intrusion. Its compact, easy-to-apply formula is optimized for rubber and similar surfaces, making it an essential tool for managers and contractors aiming for efficient, quiet, and pest-free ventilation systems.
| ASIN | B00E0Q4Y6G |
| Best Sellers Rank | #226,695 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #719 in Hardware Sealers |
| Brand | Hardcast |
| Brand Name | Hardcast |
| Color | gray |
| Compatible Material | Rubber |
| Customer Reviews | 4.7 out of 5 stars 20 Reviews |
| Included Components | DS-321-GRAY-4-1 GAL |
| Item Form | Liquid |
| Manufacturer | Hardcast |
| Material | Silicone |
| Material Type | Silicone |
| Model | 304156 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Part Number | 304156 |
| Style | Compact |
| Style Name | Compact |
| Surface Recommendation | Rubber or similar surfaces |
| UPC | 063853280050 |
| Unit Count | 128 Fluid Ounces |
| Water Resistance Level | Not Water Resistant |
A**C
Great product for sealing your ductwork!
This duct seal is fantastic! I use it to seal any penetrations, seal sheet metal corners to keep pests out of the tiny openings and most importantly I use it to glue in noise cancelling cloths inside the ductwork to reduce the sound of the metal moving when the evaporative cooler starts up.
S**F
Cool
👍
E**S
Hardcast!!
Best to seal your ac duct, we got charged $250 to apply this hardcast from an technician.
I**A
Pega rápido
Pega muy bien y rápido
S**G
Great stuff
I needed this to seal some rooftop duct work it worked just as good now as it did 20 years ago when I was doing HVAC. it was listed at a fair price
H**T
Wonderful quality
Wonderful quality , easy to apply
T**S
ease.
great stuff, easy to apply.
J**R
Five Stars
good sealer and prevents air leaks .
Trustpilot
2 weeks ago
3 weeks ago