Designed for seamless installation in residential pools, commercial centers, and therapeutic spa environments where consistent underwater illuminations is critical Made from rubber resistant to chlorine, UV rays, and temperature ( 20°C to 60°C), the 21.2cm gasket maintains flexibility through 1, 000+ hours of accelerated aging tests Ideal for pool owners, maintenance technicians, and spa facility managers requiring replacements for 79101600Z / 79104800 underwater lighting systems This complete pool light seal replacement set outperforms standard rubber gaskets with superior resistance and extended service life, ensuring years of easy operations Ensures a watertight seal and perfect for pool lights with this silicone gasket set containing resistant screws and IP68 component for leakproof underwater