IPW Industries Inc. O-ring creates a tight and powerful seal between the cap and bottom of your filtration housing, reducing risk of leakage and corresponding water damage. Additional Details ------------------------------ Bullet point: 5.48-inch (14 cm) Diameter: This large O-ring, precisely measured at 5.48 inches (14 cm), guarantees a secure, leak-proof seal essential for maintaining the efficiency of your whole house water filter system. It plays a key role in preserving the integrity of your water purifier by preventing water leaks, enhancing overall performance, and ensuring a reliable seal within your water filter housings for long-lasting filtration protection.