Designed specifically for Pentair Model 300 and 320 Chlorinator Lids, this R172009 O-Ring ensures a perfect fit and leak-free performance, enhancing the efficiency and longevity of your pool or spa's filtration system. This pack includes 6 R172009 O-Rings, crafted from durable rubber that is resistant to chlorine and other chemicals, ensuring a long-lasting seal and continuous performance without the need for frequent replacements. Our R172009 O-Rings are engineered to provide a superior seal, preventing leaks and maintaining the integrity of your pool or spa's chlorination system. The robust material stands up to harsh pool chemicals, prolonging the life of your equipment. Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Black Material:rubber Package Contents: 6 * O-Ring Replacement 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.