OEM temperature sensor replacement O‑ring designed for Sundance® and Jacuzzi® spa systems Fits all temperature sensors produced from 2002 onward (models 6600‑166, 6600‑167, 6600‑181, 6600‑751) Made of EDPM material with a Teflon coating (0.662 in inner diameter × 0.210 in thickness) for a precise, moisture‑resistant seal Ensures accurate temperature readings and helps prevent leaks around sensor housing Compact, single‑unit design for easy installation or replacement Extends sensor life and maintains reliable spa temperature control