Schaefer Brush 43218 Flue Brush 2 in Dia 7.5 in Oal

Product Description

The SCHAEFER BRUSH 43218 is a double stem, single spiral flue brush designed for cleaning flue passages, heat exchangers, and combustion venting in residential and light commercial heating systems. The brush head is constructed from tempered steel wire, providing the stiffness needed to dislodge soot, scale, and debris from metal flue liners and vent pipes. It measures 2 inches in diameter with a brush length of 4.5 inches and an overall length of 7.5 inches. The 0.25-inch male NPSM connection allows the brush to thread onto standard extension rods, making it compatible with flexible and rigid rod sets used in routine flue maintenance.

This brush is suited for cleaning small-diameter flue passages, Type B gas vent sections, and similar round metal venting components found in furnaces, boilers, and water heaters. HVAC technicians and plumbers use it during annual maintenance inspections or after system shutdowns to clear residue buildup that can restrict draft and reduce combustion efficiency. Its compact 2-inch diameter makes it a practical choice for smaller residential vent runs and individual heat exchanger tubes.

Key Features

• Tempered steel wire brush construction for effective removal of soot and combustion deposits
• Double stem design provides structural support for consistent spiral contact with flue wall surfaces
• 2-inch brush diameter targets small-diameter flue passages and heat exchanger tubes
• 4.5-inch brush length covers adequate surface area per pass
• 0.25-inch male NPSM connection threads onto standard extension rod sets
• Lightweight at 0.38 pounds for easy handling during overhead or confined-space work

Compatibility

Designed as an OEM-style replacement and maintenance brush for use with standard 0.25-inch NPSM threaded extension rod systems in residential and light commercial flue cleaning applications.

Installation Notes

Installation and use of this flue brush should be performed by a qualified HVAC technician or plumber. Always shut down the heating appliance and allow the flue system to cool completely before inserting any brush or rod into the venting. Inspect the connection between the brush and extension rod to confirm the NPSM thread engagement is secure before applying rotational force. Follow applicable codes such as NFPA 54 and IFGC guidelines when servicing gas venting systems.