Culligan 3/4 in. Water Filter O-Ring 2-Pack is designed as a reliable O-ring for whole house water filter systems featuring a 3/4-inch inlet and outlet. This pack includes two durable O-rings that ensure a secure and leak- fit, helping maintain the efficiency and performance of your water filtration system. Made by Culligan, a name in water treatment, these O-rings are an essential part of keeping your water filter running smoothly and preventing leaks. Model Number: OR-34A