Balboa Heater O-Ring/Gasket [2"] (21619)

Replacement 2" heater O-ring/gasket for Balboa heater unions — provides a reliable seal to prevent leaks in hot water systems.

• Part number: 21619 (alternative reference: 711-4030)
• Dimensions: inside diameter ~2-1/8", outside diameter ~2-7/8", cross-section ~1/8"
• Use: seals Balboa heater unions during routine maintenance or heater replacement

Replace worn or flattened gaskets during heater service to maintain flow and prevent leaks.