Northern Radiator Cap 16 PSI w/ Adjustable Sacrificial Magnesium Anode

Protect and extend the life of your vehicle’s cooling system with the Northern radiator cap featuring an adjustable magnesium sacrificial anode (Z17700). This innovative universal-fit cap fights internal corrosion by attracting harmful electrolytes before they can damage your radiator or components. The adjustable design allows a fitment depth from 3-1/2" to 6", covering a wide range of applications. Built with both upper and lower seals for a secure fit, this 16 PSI cap ensures proper pressure control and leak prevention. Key dimensions include a 1-1/2" lower seal diameter, 2-1/4" upper I.D., and 3/4" internal height with the spring extended. Perfect for restorations, daily drivers, and high-performance builds, this radiator cap provides dependable cooling system protection with long-term reliability.

Features and Benefits:
- Universal design fits a wide range of applications
- Adjustable depth from 3-1/2" to 6"
- Sacrificial magnesium anode prevents corrosion
- 16 PSI pressure rating
- Includes both upper and lower seals for leak prevention
- Internal height with spring extended: 3/4"
- Lower seal diameter: 1-1/2"
- Upper inside diameter: 2-1/4"
- Extends radiator and cooling system life

Additional Notes:
- Measurements are for reference only and may vary with application
- Marching existing PSI is critical in selecting your radiator cap