Precision Fit for Hayward Models: Designed specifically for Hayward SwimClear C100S, C150S, C200S, ReGenX RG450, RG700, and ASL C850, C1250 filter heads, ensuring a perfect seal to maintain efficient pool filtration. Durable Material for Longevity: Crafted from rubber, this O-ring offers excellent abrasion and corrosion resistance. Its robust composition prevents aging and oxidation, extending the lifespan of your pool's filtration system. Restore Optimal Performance: Replacing your pool's filter head O-ring with our compatible model will rejuvenate your system's efficiency. This simple maintenance step can significantly enhance the performance and effectiveness of your pool's filtration. Comprehensive Compatibility: This O-ring is interchangeable with part numbers CXFHR1001, RGX45G, and HAY-051-640. It serves as a universal solution for various Hayward and ReGenX filter systems, making it a versatile replacement part. Product Specifications: Each O-ring features an inner diameter of 29.15Cm and a wire diameter of 7.1mm, meticulously engineered to ensure a snug and secure fit, preventing leaks and maintaining consistent water flow through your filter. Colour:Black Material:rubber Package Contents: 1 Filter Head O-Ring Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.