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The OATEY RTB3 is a 3-inch test-ball plug designed to pressure-test drain, vent, and waste (DWV) piping systems. It inflates to create a reliable seal inside the pipe, isolating sections of the system for inspection and leak testing. The RTB3 inserts through a standard test tee and is capable of sealing out-of-round pipe, making it a practical choice for both new construction and retrofit testing scenarios. Licensed plumbers and pipefitters keep these plugs on hand as a standard part of their DWV testing toolkit.
The RTB3 is suited for residential and light commercial drain, vent, and waste system testing. It works in any pipe material type, including PVC, ABS, cast iron, and clay. The plug inserts through a test tee fitting and inflates to seat firmly against the pipe wall, allowing the technician to pressurize the isolated section and verify system integrity before inspection sign-off or final cover.
Designed as an OEM-style replacement test-ball plug for use in 3-inch drain, vent, and waste piping systems across residential and commercial plumbing applications.
Installation is performed by a licensed plumber or pipefitter in accordance with local plumbing codes and the International Plumbing Code (IPC). Ensure the system is depressurized and drained before inserting or removing the plug. Insert the RTB3 through the test tee opening and inflate to the manufacturer-specified test pressure before applying system test pressure. Never exceed the rated working pressure of the plug or the piping system under test.
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