









🛡️ Seal smart, seal strong — the pro’s secret weapon for flawless HVAC & plumbing fixes!
RectorSeal Duct Seal 81880 is a gray, soft, non-toxic putty compound designed for professional HVAC, plumbing, and metal fabrication use. It hand-molds easily to most clean, dry surfaces and creates a durable, air- and water-tight seal resistant to water, alcohol, and mild acids. Safe for plastics and metals, asbestos-free, and paintable immediately after application, it offers versatile, reusable sealing from 25°F to 120°F—trusted by tradesmen for reliable, long-lasting performance.









| ASIN | B008A3UG94 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #3,319 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #5 in Hardware Sealers |
| Brand | Rectorseal |
| Color | Gray |
| Customer Reviews | 4.7 4.7 out of 5 stars (1,630) |
| Date First Available | April 26, 2012 |
| Global Trade Identification Number | 00021449818803 |
| Included Components | Duct Seal Compound |
| Item Form | Putty |
| Item Package Quantity | 1 |
| Item Weight | 15.8 ounces |
| Item dimensions L x W x H | 6.5 x 3 x 3 inches |
| Item model number | 81880 |
| Manufacturer | The Rectorseal Corporation |
| Material | Putty |
| Number Of Pieces | 1 |
| Number of Items | 1 |
| Part Number | 81880 |
| Product Dimensions | 6.5 x 3 x 3 inches |
| Size | 1 pound (pack of 1) |
| Special Features | Non-toxic |
| Style | 1 lb |
| Surface Recommendation | Adheres to most clean dry surfaces |
| UPC | 021449818803 |
| Unit Count | 1.0 Count |
| Water Resistance Level | Water Resistant |
A**A
Great product to have around
Wow, wish I had known about this product before! I purchased it after searching for a way to seal a draft coming in around an interior water pipe. The stickiness was very good yet it was easy to work with, and it took care of sealing out the cold air coming in around the pipe, I highly recommend this.
P**Y
Sealed around my furnace and it did a great job - I think it will last a long time.
I installed a whole house humidifier (it's dry here in Colorado in the winter) on my furnace and wanted to seal the outside and a certain AI assistant recommended this stuff. It was a good call, I rolled it with my hands into cylinders and put it around the humidifier and the seal is solid and seems like it will last a long time. I am very pleased. It's sticky but not super sticky, pliable but seems like it will stay in place. It doesn't smell much (if at all) and I washed my hands with soap and water and most of it came off with minimal effort.
A**W
As Described / Works Good.
This stuff is pretty soft and easy to install. It's about the same price as the big box stores for the same amount but I didnt have to leave the house and drive all the way to pick it up. So in that sense it saved me a bit of money.
D**D
Easy application
Worked as expected.
F**R
Nice and sticky!
Sticks well to brick walls without any prior preparations. Very easy to work with!
J**V
Works good
Worked great for multiple uses. Durable and flexible
M**H
Great to fill pipe gaps in exterior
Easy to use. Rolled out section and wrapped around AC pipe and water spigots to fill small gaps. So far, so good.
S**T
Exceptional Value!
After recently residing my house, I needed a block of this material to seal the gas line's service entrance. Although the gap was small enough to seal with a bead of caulk, this stuff is easier and less messy to apply with the same result. Product Quality: It's tough to determine this type of material's quality visually although I've used this material and brand before and it's an excellent, moldable, non-hardening sealant. Product Use: Fresh from the delivery truck in 30 degree weather, the block was stiff, but still moldable. It became increasingly malleable with the rise in indoors temperature, reaching clay-like moldability. Although this material is sticky, it leaves no sticky residue on either hands or applied surfaces. Final Thoughts: If you need to seal the wire or pipe poking through your wall to the great outdoors, this is the stuff to use. It's less messy than caulk, arguably longer lasting, and there's considerably less waste material. Since it's non-hardening, it should last if stored properly. And it's a third of the cost on Amazon as at the big box store! I bought second block "just in case."
R**R
was easy to use for putting around pipes coming out of fridges
W**D
تم تجربته على فتحات في جدران الاسمنتيه يقوم باغلاق الفتحه بشكل ممتاز يعمل كانه صلصال وليس ايضا يعمل ايه اضرار ويتحمل الاجواء الخارجيه وبامكانك ازالته في اي وقت
K**W
I used this sealing product around my pipes and vent outside . The previous sealant had cracked and ants were getting inside. It was very easy to use and wasn't messy at all. I had some left over so I put the package into a ziploc bag. It did a great job for me and the price was very reasonable.
M**E
Good
S**E
Works very well and shipped when stated. Would recommend to anyone!
Trustpilot
1 week ago
3 weeks ago