The Zodiac W13064 O-Ring is a high-quality pool equipment part designed for the Nature2(R) Professional G Plus Mineral Chamber Cap. Made of durable rubber material, this black o-ring is designed to last and provide a secure seal for your pool equipment. With a length of 6 inches, this set includes one o-ring to ensure a proper fit and function. Trust the Zodiac brand to provide reliable pool equipment parts to keep your pool or spa running smoothly.