0.625"X 42" Aluminum Anode Rod

OEM Replacement Aluminum Anode Rod for Rheem Residential Tank Water Heaters

The Rheem AP12938 is a direct replacement aluminum anode rod designed for use in standard residential electric and gas water heaters. Its primary function is to provide cathodic protection to the interior tank lining by acting as a sacrificial metal in systems prone to galvanic corrosion. This component is critical for preserving the structural integrity of the storage tank and preventing premature failure.

Constructed from aluminum, this anode rod is especially effective in municipal water systems with high conductivity or softened water conditions, where magnesium anodes may deplete too rapidly or contribute to odor issues. Regular anode rod inspection and replacement is a key part of any water heater maintenance program.

Specifications

• Part Number: AP12938
• Material: Solid aluminum
• Diameter: 0.625 in (5/8")
• Length: 42 in
• Thread Size: 3/4" NPT
• Installation Type: Threaded—suitable for top-mount access

Intended Use and Compatibility

This anode rod is engineered for standard vertical installation in Rheem residential tank-type water heaters. It can also be used in other brands that accept 3/4" NPT-threaded anode ports, but cross-reference with the original unit's documentation is required to confirm compatibility. Use of an OEM or equivalent anode is recommended to maintain warranty and performance standards.

Installation Guidelines

Installation requires overhead clearance for full-length rod insertion. Ensure that the system is depressurized and powered off before service. Threaded connections should be sealed with a non-petroleum thread compound or PTFE tape. Torque must be applied uniformly to avoid cross-threading. We recommend that replacement be handled by a licensed plumbing technician familiar with domestic water heating systems and code requirements.

Replacement frequency is typically every 3 to 5 years, depending on water chemistry and usage patterns. In softened water or high-temperature applications, more frequent inspection may be necessary. Anode rods showing significant pitting or material loss should be replaced immediately to maintain tank protection.

Key Functions

• Corrosion Mitigation: Aluminum provides galvanic protection for steel-lined storage tanks
• Serviceability: Standard dimensions enable fast replacement during routine maintenance
• Application Range: Suitable for residential tank water heaters in regions with aggressive water chemistry

Professional Insight

Stocking this component is recommended for service contractors performing tank flushes, odor remediation, or corrosion evaluations. In areas with known water quality concerns, replacing magnesium rods with aluminum may reduce customer callbacks due to odor complaints and extend tank life where aggressive scaling is less of a concern.