10Pcs Silicone Rubber Hole Plugs 3–12mm High-Temp Seal Caps
10Pcs Silicone Rubber Hole Plugs 3–12mm High-Temp Seal Caps
10Pcs Solid Silicone Rubber Hole Plugs — Versatile Seal Caps for Car Body Panels & More
Keep moisture, dust, and debris out with these durable silicone rubber hole plugs. Designed to fit holes ranging from 3mm to 12mm, this 10-piece set delivers a clean, professional finish on car body panels, chassis, electrical enclosures, machinery, and household surfaces. Made in Mainland China.
Key Features
- Premium Silicone Rubber: Soft, flexible, and elastic material that creates a tight, reliable seal without cracking or shrinking over time.
- Extreme Temperature Range: Rated from -40°C to +250°C (-40°F to 482°F), making these plugs suitable for under-hood automotive applications and high-heat environments.
- Multi-Size Pack: Covers a range of hole diameters (3mm–12mm) so you're prepared for a variety of repair and finishing tasks.
- Flat Gasket Shape: Flush-fitting design sits neatly against surfaces for a tidy, factory-style appearance.
- Corrosion & Chemical Resistant: Withstands exposure to acids, alkalis, and general automotive fluids, ensuring long-lasting performance.
- Anti-Aging Formula: UV- and ozone-resistant silicone compound maintains integrity through years of use.
- Color: Black — blends seamlessly with most automotive and industrial surfaces.
- Material: Silicone Rubber
Typical Uses
- Car body panel hole sealing and finishing
- Automotive firewall and floor pan openings
- Electrical enclosure and control box knockout blanks
- Sheet metal fabrication and repair
- General DIY home and workshop projects
Specifications
| Material | Silicone Rubber |
| Color | Black |
| Hole Size Range | 3mm – 12mm |
| Shape | Flat Gasket |
| Temperature Resistance | -40°C to +250°C |
| Quantity | 10 Pieces |
| Origin | Made in Mainland China |
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Learn more: FuelEconomy.gov driving efficiency guidance
Frequently Asked Questions
Q: What hole sizes do these rubber hole plugs fit?
A: These silicone rubber hole plugs are designed to cover holes ranging from 3mm to 12mm in diameter. The pack includes multiple sizes so you have the right plug ready for different panel openings and applications.
Q: Are these hole plugs safe to use in high-temperature automotive environments?
A: Yes. The silicone rubber compound is rated for temperatures between -40°C and +250°C, making them suitable for engine bay, firewall, and under-body locations where heat exposure can be significant.
Q: Can these plugs be used on surfaces other than cars?
A: Absolutely. While they are popular for car body panel repair, these versatile hole seal caps work equally well on electrical enclosures, sheet metal, appliances, cabinetry, and general DIY workshop projects.
Q: How do I install the rubber hole plugs?
A: Simply press the plug firmly into the hole until the flange sits flush against the surface. The flexible silicone material compresses and expands to grip the edges of the hole, creating a secure, water- and dust-resistant seal — no tools or adhesive required.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.