One & Two Seal
Expandable Rubber Plugs

Cut Your Delivery Time

FROM
WEEKS
TO DAYS!

See how fast we can deliver!

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.

Plug Sizing Chart

Installing Tube Plugs?

Snap It® Engineered Tube Plugs

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 – 5/8	12 – 16	EP-IS-0.5	EP-ID-0.5	EP-FS-0.5	EP-FD-0.5
5/8 – 3/4	16 – 19	EP-IS-0.625	EP-ID-0.625	EP-FS-0.625	EP-FD-0.625
3/4 – 7/8	19 – 22	EP-IS-0.75	EP-ID-0.75	EP-FS-0.75	EP-FD-0.75
7/8 – 1	22 – 25	EP-IS-0.875	EP-ID-0.875	EP-FS-0.875	EP-FD-0.875
1 – 1-1/8	25 – 29	EP-IS-1.0	EP-ID-1.0	EP-FS-1.0	EP-FD-1.0
1-1/8 – 1-1/4	29 – 32	EP-IS-1.125	EP-ID-1.125	EP-FS-1.125	EP-FD-1.125
1-1/4 – 1-3/8	32 – 35	EP-IS-1.25	EP-ID-1.25	EP-FS-1.25	EP-FD-1.25
1-3/8 – 1-1/2	35 – 38	EP-IS-1.375	EP-ID-1.375	EP-FS-1.375	EP-FD-1.375
1-1/2 – 1-5/8	38 – 41	EP-IS-1.5	EP-ID-1.5	EP-FS-1.5	EP-FD-1.5
1-5/8 – 1-3/4	41 – 45	EP-IS-1.625	EP-ID-1.625	EP-FS-1.625	EP-FD-1.625
1-3/4 – 1-7/8	45 – 48	EP-IS-1.75	EP-ID-1.75	EP-FS-1.750	EP-FD-1.75
1-7/8 – 2	48 – 51	EP-IS-1.875	EP-ID-1.875	EP-FS-1.875	EP-FD-1.875
2 – 2-1/8	51 – 54	EP-IS-2.0	EP-ID-2.0	EP-FS-2.0	EP-FD-2.0
2-1/8 – 2-1/4	54 – 57	EP-IS-2.125	EP-ID-2.125	EP-FS-2.125	EP-FD-2.125
2-1/4 – 2-3/8	57 – 60	EP-IS-2.25	EP-ID-2.25	EP-FS-2.25	EP-FD-2.25