






🔩 Seal it tight, protect it right — don’t let your electrical box miss out!
The AP-12055 Pre-assembled Knockout Seal by Airmont Products is a 2-inch trade size, screw and bar type seal made from galvanized steel with a zinc coating. Designed for quick installation, it provides an airtight, dust-tight, and corrosion-resistant barrier to cover unused knockout holes in electrical boxes, ensuring protection from moisture, dust, and pests.





| Manufacturer | Airmont Products |
| Part Number | AP-12055 |
| Item Weight | 2.39 ounces |
| Package Dimensions | 3.58 x 2.95 x 0.55 inches |
| Item model number | AP-12055 |
| Size | 2 Inch Trade Size |
| Color | Silver |
| Style | Screw and Bar Type |
| Material | Galvanized Steel |
| Pattern | Screw and Bar Type |
| Installation Method | Screw and Bar |
| Number Of Holes | 1 |
| Included Components | Pre-assembled Screw and Bar |
| Batteries Included? | No |
| Batteries Required? | No |
M**H
Knockout Seal Does the Job
The meter base at a house on the Oregon coast corroded enough that a knockout seal came out. Once I had cleaned up the opening, I had a 3 and one-half inch hole to cover. The PUD would only accept a knockout seal and one that big is hard to find. But here it is! For a reasonable price and arrived in a few days. I installed it yesterday and it fit perfectly. In short, it worked exactly as advertised.
A**N
Exactly as described
Exactly as described. Works great. Quick service saved my sale.
M**T
Great transaction!
Item as described and arrived on time...good to go!
M**I
Works
Works like it should
B**B
3" = 4 1/2"
It’s got a 4.5” full diameter, might be normal for these kind of things but I’m not an electrician so I didn’t expect that and it’s too big for my electrical box, 4 stars because of painless return. Please add the full diameter to the description for DIYers
N**R
Good
Worked for what I wanted
P**E
Fits an actual 3" hole.
This knock-out seal is for a nominal 2-1/2" conduit hole, but fits an actual measured 3" sized hole. I had a 3" hole in some sheet metal and this fit perfectly.
T**M
Good item
Fits the need
Trustpilot
1 week ago
4 days ago