New 2″ O-Ring / Gasket seals better than the standard O-Ring your spa originally had. Replaces Flow Through Heater O-Ring with 2 1/2″ diameter.
Makes a more positive seal than a standard Heater O-Ring.
Call if you have a question about the proper size for your job.

SKU: 01563-20
Manufacturer: Dimension One Spas®

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