Culligan 3/8 in. Water Filter O-Ring is designed as a reliable part for whole house water filter systems that have a 3/8-inch inlet and outlet. This durable O-ring ensures a secure fit and helps maintain the integrity of your water filtration system, preventing leaks and ensuring optimal performance. Made by Culligan, a name in water treatment, this O-ring is an essential component for keeping your system running smoothly and efficiently. Model Number: OR-38