Jacuzzi® / Sundance® Diverter Gate O-Ring – Viton® 2.175″ × 0.103″ – part #6540-550

Q: What does 6540-550 fit?

A: It fits the diverter gate / valve assemblies used in Jacuzzi® and Sundance® spas, especially ones using the 6540-568 gate body.

Q: What are the dimensions of this O-ring?

A: 2.175″ inner diameter, 0.103″ cross-section (thickness).

Q: What material is used?

A: Viton® (fluorocarbon elastomer), chosen for chemical and heat resistance.

Q: Does this O-ring replace 6540-966?

A: Yes — in many updated diverter assemblies, 6540-550 supersedes 6540-966. hottubsupplystore.com+1

Q: How do I install it properly?

A: Use appropriate silicone-compatible lubricant, seat it evenly, and reassemble carefully to avoid twisting the seal.

Power off spa and ensure no pressure is in piping before service.

Remove the diverter valve body or access panel.

Extract the old O-ring carefully from the stem groove.

Clean seating groove and stem surfaces with a soft cloth.

Lightly lubricate the new Viton® O-ring with silicone lubricant compatible with spa use.

Install the new 6540-550 O-ring into the groove securely and evenly.

Reassemble the diverter valve and test for leaks and correct water flow.