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Heat Exchanger, Boiler & Condenser Tube Plugs

One & Two Seal
Expandable Rubber Plugs

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Product Overview
Expanding Tube Plugs
Low & High Pressure — Heat Exchangers, Boilers & Condensers

Ideal for temporarily or permanently plugging heat exchanger, boiler, or condenser tubes — expanding tube plugs withstand up to 100 PSI*, resist oil and gasoline, perform from -45°F to 300°F, and install with just a socket wrench. Reusable and long-lasting with proper care.

Pressure Rating
Rated to 100 PSI* with proper installation — neoprene construction rated to 150 PSI when installed correctly. *Dependent on surface roughness and plug size. Wire brushing to a clean surface gives best performance.
Temperature Range
Performs reliably from -45°F to 300°F — resistant to oil and gasoline in demanding service environments.
Installation
Easy installation with a standard socket wrench — no special tooling required. Reusable with proper maintenance. Optional safety lanyards available upon request.
Availability
In-stock items ship within 24 hours. Grade K-2247-CF, ASTM-BC 412 — 45±5 Durometer hardness.
Internal Seal vs. Flanged Seal Configurations
Flanged Seal: A flange on the outer side sits flush against the tubesheet — prevents inward movement in vacuum-generating units.

Internal Seal: Ideal when the plug must be placed at an exact location inside the tube — no external flange.

Both configurations are available in single- or double-seal options. For maximum sealing effectiveness, the double-seal expanding plug is recommended.
Important Installation Note
Always puncture the tube before installing any plug to ensure that pressure cannot build up inside the tube — preventing plugs from loosening or blowing out.
USA Industries
(800) 456-8721  ·  usaindustries.com
Product Selection Guide
EP Seal Part Number Chart
Select by tube I.D. and pressure rating to find your part number
For Tube I.D.'s Pressure Rating
120  |  150 120  |  150
(in.) (mm) Internal
Single Seal		 Internal
Double Seal		 Flanged
Single Seal		 Flanged
Double Seal
1/2 – 5/812 – 16EP-IS-0.5EP-ID-0.5EP-FS-0.5EP-FD-0.5
5/8 – 3/416 – 19EP-IS-0.625EP-ID-0.625EP-FS-0.625EP-FD-0.625
3/4 – 7/819 – 22EP-IS-0.75EP-ID-0.75EP-FS-0.75EP-FD-0.75
7/8 – 122 – 25EP-IS-0.875EP-ID-0.875EP-FS-0.875EP-FD-0.875
1 – 1-1/825 – 29EP-IS-1.0EP-ID-1.0EP-FS-1.0EP-FD-1.0
1-1/8 – 1-1/429 – 32EP-IS-1.125EP-ID-1.125EP-FS-1.125EP-FD-1.125
1-1/4 – 1-3/832 – 35EP-IS-1.25EP-ID-1.25EP-FS-1.25EP-FD-1.25
1-3/8 – 1-1/235 – 38EP-IS-1.375EP-ID-1.375EP-FS-1.375EP-FD-1.375
1-1/2 – 1-5/838 – 41EP-IS-1.5EP-ID-1.5EP-FS-1.5EP-FD-1.5
1-5/8 – 1-3/441 – 45EP-IS-1.625EP-ID-1.625EP-FS-1.625EP-FD-1.625
1-3/4 – 1-7/845 – 48EP-IS-1.75EP-ID-1.75EP-FS-1.750EP-FD-1.75
1-7/8 – 248 – 51EP-IS-1.875EP-ID-1.875EP-FS-1.875EP-FD-1.875
2 – 2-1/851 – 54EP-IS-2.0EP-ID-2.0EP-FS-2.0EP-FD-2.0
2-1/8 – 2-1/454 – 57EP-IS-2.125EP-ID-2.125EP-FS-2.125EP-FD-2.125
2-1/4 – 2-3/857 – 60EP-IS-2.25EP-ID-2.25EP-FS-2.25EP-FD-2.25
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