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🛠️ Seal smarter, not harder — the tradesman’s secret weapon!
RectorSeal Duct Seal 81880 is a gray, soft, non-toxic putty compound designed for HVAC, plumbing, and metal fabrication sealing. It adheres to most clean, dry surfaces, is reusable, and works effectively between 25°F and 120°F. This asbestos-free sealant creates a water- and air-tight barrier resistant to mild acids and won’t corrode metals or harm plastics. Paintable immediately after application, it’s trusted by professionals for durable, versatile sealing solutions.










| ASIN | B008A3UG94 |
| Best Sellers Rank | #2,670 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #8 in Hardware Sealers |
| Brand | Rectorseal |
| Brand Name | Rectorseal |
| Color | Gray |
| Compatible Material | Metal |
| Customer Reviews | 4.7 out of 5 stars 1,755 Reviews |
| Global Trade Identification Number | 00021449818803 |
| Included Components | Duct Seal Compound |
| Item Dimensions | 6.5 x 3 x 3 inches |
| Item Form | Putty |
| Item Type Name | Duct Seal Compound |
| Item Weight | 0.45 Kilograms |
| Item dimensions L x W x H | 6.5 x 3 x 3 inches |
| Manufacturer | The Rectorseal Corporation |
| Material | Putty |
| Material Type | Putty |
| Model | 81880 |
| Number of Items | 1 |
| Part Number | 81880 |
| Style | 1 lb |
| Style Name | 1 lb |
| Surface Recommendation | Adheres to most clean dry surfaces |
| UPC | 021449818803 |
| Unit Count | 1.0 Count |
| Water Resistance Level | Water Resistant |
K**G
Good stuff, great quality, great feel
Love this stuff works great for my application, the consistency of the product is nice and firm, looks like it's gonna stay flexible for a while and you don't have to worry about it drying out, it's a nice thick product that will be compatible with a lot of your applications. You can use this for a lot of different things, it'll be compatible with so many of your projects ones especially where you can't use grommets because of space constraints or anytime you need a extra seal on something, this stuff is great, most of all it's not supposed to dry out so that makes it really useful.
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**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.
B**N
Putty to seal water leak.
Worked great on my outdoor water fountain! After the guys installed it last summer, it kept leaking water.And I didn't install it , so I didn't know what was wrong with it. But I ask Amazon, would I needed to fix that problem?And they told me I needed to seal it with putty. It just arrived today, and I already sealed , where the cord comes up through the hole to meet the pump and its not leaking at all, working great!!!
D**D
Easy application
Worked as expected.
R**.
AWESOME
This stuff is AWESOME. The 1lb block was easily enough to seal all of the holes around my pipes in the kitchen and 2 bathrooms. Mice cannot get past it. It's like playdoh for consistency. Break off a piece, roll it into a tube and press in place. Looks good too. It's "sticky" but won't stick to your hands. It won't dry out either. I am going to order another block of it to seal a large crack where my garage and house foundation meet. Excellent
J**N
Versatile and Easy to Use: Great for Sealing Gaps Around the House
I came across this duct seal compound online and figured it would be a good idea to keep a bar in my workshop for future use. At the time, I didn’t have a specific project in mind, but it has already proven its value. I noticed some small gaps around the screens of my raised foundation and decided to give this compound a try to seal them up. It worked perfectly for what I needed. Even though I believe the compound is more commonly used for insulation-related sealing, I was concerned about bugs or small critters getting through those gaps. This sealant applied easily and gave me a solid, secure seal. I haven’t painted over it yet, but visually it looks like it’s holding up well. I ended up using almost a whole bar for this project, but I’m happy with the result and plan to pick up another bar just to have on hand for future repairs or sealing jobs. It’s always handy to have something like this around, and it’s proven to be a versatile solution.
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
great putty
was easy to use for putting around pipes coming out of fridges
Z**T
Much better than spray foam for small gaps!
"I used this to seal around the electrical conduit where it enters my house, and it was so easy to work with. It’s like a soft modeling clay that stays pliable, so you can really pack it into gaps to stop drafts and bugs. Unlike spray foam, it’s not messy and you can actually remove or adjust it later if you need to. Great price for a very effective product!"
W**D
منتج مميز
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
Very Useful
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
Good
Trustpilot
2 days ago
3 weeks ago