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.<br><br>Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Black Material:rubber<br><br>Package Contents: 6 * O-Ring Replacement<br><br>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.