Balboa 1.5″(40mm) Heater Gasket

The Balboa 40mm Heater Union Gasket is a precision-fit replacement seal designed for use on the GS100 10″ heater tube. One side features a slightly rounded edge, while the other has a thicker square edge for a secure, leak-free seal.

• Outer diameter: approximately 58mm
• Total thickness: 6mm (including raised edges)
• Thickness (excluding raised edges): 2.5mm
• Commonly used on the Balboa GS100 10″ heater tube

Frequently Asked Questions

What heater is this gasket compatible with?

This gasket is designed for the Balboa GS100 10″ heater tube and is a direct replacement for the 40mm heater union seal.

What are the dimensions of this gasket?

The gasket is approximately 58mm in outer diameter and 6mm in total thickness (including the raised edges), with a 2.5mm thickness excluding the raised edges.

What does the O-ring look like?

One side has a slightly rounded edge and the other has a thicker square edge, which helps create a watertight seal at the heater union joint.

Is this an OEM Balboa part?

This is a compatible replacement gasket for Balboa heater unions. Check your existing part number or heater model to confirm fitment before ordering.