Single & Double Seal Expanding Rubber Tube Plugs
Single and double seal expanding plugs for temporary or permanent plugging of heat exchanger, boiler, and condenser tubes. They install with a standard socket wrench, resist oil and gasoline, and are reusable with proper care.
Get a Quote or Order
Call (800) 456-8721 or send us these details and we'll respond the same business day.
- Tube I.D. (see the part number chart)
- Internal or flanged seal
- Single or double seal
- Safety lanyards, if needed
- Quantity and date needed
See Snap It® Engineered Tube Plugs ›
| Specification | Details |
|---|---|
| Configurations | Internal seal • Flanged seal |
| Seals | Single • Double (double recommended) |
| Tube I.D.s | 1/2" through 2-3/8" (12 to 60 mm) |
| Pressure Rating | Up to 100 PSI* (*depends on surface roughness and plug size) |
| Temperature | -45°F to 300°F |
| Rubber | Neoprene (Grade K-2247-CF, ASTM-BC 412) |
| Hardness | 45 ± 5 Durometer |
| Resistance | Oil • Gasoline |
| Installation | Standard socket wrench (safety lanyards on request) |
| Delivery | In-stock items ship within 24 hours |
Internal Seal vs. Flanged Seal
Expanding Plug Part Numbers
| For Tube I.D. | Internal Seal | Flanged Seal | |||
|---|---|---|---|---|---|
| (in.) | (mm) | Single Seal | Double Seal | Single Seal | Double Seal |
Puncture, Clean, Tighten
- Puncture the tube so pressure can't build up and loosen or blow out the plug. The One-Rev Internal Tube Cutter does it in a single revolution.
- Wire brush the tube I.D. to a clean surface for the best pressure performance.
- Insert and tighten with a standard socket wrench until the rubber expands against the tube wall.
Snap It® Engineered Tube Plugs
For a pressure rated, repeatable seal well beyond rubber plugs, choose Snap It®. It installs hydraulically in under 60 seconds.
Cut Delivery From Weeks to Days
In-stock expanding plugs ship within 24 hours. See how fast we can deliver.
Expanding Plug FAQ
Should I choose an internal or flanged seal?
Choose flanged when the plug needs to sit flush against the tubesheet, such as in vacuum-generating units where the plug could be pulled inward. Choose internal when the plug has to sit at an exact location inside the tube.
Single seal or double seal?
Both work, but we recommend the double seal for maximum sealing effectiveness.
How much pressure will these plugs hold?
Up to 100 PSI with proper installation. Performance depends on surface roughness and plug size, so wire brush the tube to a clean surface first. For higher pressure, see Snap It® tube plugs.
Are expanding rubber plugs reusable?
Yes. With proper care they're long-lasting and reusable.
What tools do I need to install them?
Just a standard socket wrench. Puncture the tube first so pressure can't build up behind the plug.
Why Choose USA Industries
From pipe blinds to heat exchanger tools, we deliver custom-engineered products with the fastest turnaround times in the industry.
Fastest Turnaround
Available 24/7 - 365 days a year with same-day shipping available on stock items. Custom orders in days, not weeks.
Direct Pricing
No middlemen markup. Buy direct from the manufacturer with 40+ years of industry excellence and save.
Custom Engineering
Custom solutions designed to your exact specifications.
ISO Certified Quality
A quality driven ISO 9001:2015 certified manufacturer ensures consistent excellence.
BBB A+ Rated
The highest grade awarded, signifying USAI operates with high integrity and a strong commitment to resolving customer issues.