The Pentair 355030Z O-Ring is a high-quality replacement part designed for use with Pentair Challenger Pinnacle high flow pool and spa inground pumps, as well as Pentair SuperFlo and Sta-Rite SuperMax pool and spa pumps. This black O-Ring is specifically designed for the diffuser quad and ensures a secure and leak-free connection. With dimensions of 6-inch length, 1-inch height, and 4-inch width, this O-Ring is the perfect fit for your pump. Keep your pool or spa running smoothly with the Pentair 355030Z O-Ring.