NBK-21027 Magnesium Anode Rod 3/4″ x 42″ with Hex Plug | Replaces Rheem AP12938
The NBK-21027 Magnesium Anode Rod is an essential corrosion-protection component for outdoor wood boilers and water heater tanks. By attracting corrosive minerals and electrochemical activity away from the tank walls, the sacrificial magnesium rod quietly does its job extending tank life, preventing rust, and protecting your investment season after season. At 42 inches long with a standard 3/4″ hex plug, its a direct drop-in replacement for Rheem AP12938 and Grainger 45W630.
Key Features
- Magnesium Construction Superior sacrificial anode material that actively attracts corrosive elements to protect tank walls
- 3/4″ Hex Plug Standard connection size compatible with most outdoor boiler and water heater tanks
- 42″ Length Full-length coverage for maximum tank protection and extended service intervals
- Direct OEM Replacement Drop-in replacement for Rheem AP12938 and Grainger 45W630
- Extends Tank Life Regular anode replacement is the single most effective way to prevent premature tank failure
Specifications
- SKU: NBK-21027
- Part Number: SO-21027-NBK
- Material: Magnesium
- Plug Type: 3/4″ Hex Plug
- Rod Diameter: 3/4″
- Rod Length: 42″
- Application: Outdoor wood boilers, water heater tanks
Replaces / Cross-Reference
- Rheem: AP12938
- Grainger: 45W630
Common Applications
- Outdoor wood boilers and biomass boilers
- Residential and commercial water heater tanks
- Any hot water system requiring sacrificial anode corrosion protection
Installation Tips
- Turn off the water heater or boiler and allow the system to cool before servicing
- Relieve tank pressure before removing the existing anode rod
- Apply thread sealant or plumbers tape for a leak-free installation
- Inspect anode condition annually replace when more than 50% depleted for best protection
Why Choose the NBK-21027?
A depleted anode rod is the leading cause of premature water heater and boiler tank failure. The NBK-21027 restores full corrosion protection with a full-length 42″ magnesium rod the same specification as Rheem AP12938 at a fraction of the OEM cost. A simple annual inspection and timely replacement can add years of life to your tank.
SPECIAL ORDER NOTICE: This item is sourced through our special order program. Please allow 12 business days for processing prior to shipment.
