Built for targeted pool equipment repairs, this replacement component helps restore the specific fit and function expected from a Jandy/Zodiac system. JS60/JS100 Tank Lid Quad Ring is a sealing component used to help stop water or air leaks in the matching Jandy assembly. O-rings and quad rings harden, flatten, stretch, or crack after exposure to chemicals, heat, and repeated service. Replacing the correct seal during maintenance helps restore compression, improves leak resistance, and can prevent unnecessary replacement of the larger lid, union, valve, or tank component. The product title, category, and part number point to a specific service application, so this description is written to help shoppers understand the repair role without overstating compatibility. Part R0487400 should be checked against the existing component and equipment manual before purchase. It is especially useful for seal-focused repair searches where a small replacement can stop leaks and extend the.