This is an IPW Industries Inc. pack of 2 o-rings compatible with the AO Smith Whole House Sediment Filter (AO-WH-PRE or AO-WH-PREV). With 3.44" (9 cm) actual size this o-ring is designed to fit standard 2.5" filter housing. Keep the water-tight seal on your whole house sediment filter. Replacements made easy - use when you change out your filter every 3-6 months. Pack includes 2 o-rings. Additional Details ------------------------------ Bullet point: PRODUCT SIZE: This durable 3.44 inch (9-cm) water filter o-ring is made to provide a secure fit for standard 2.5 inch water filter housings. Ideal for water filter systems, it ensures optimal performance by preventing leaks and maintaining a tight seal. Perfect for whole house water filter systems, it offers reliable protection for clean, filtered water. Replace worn o-rings for enhanced efficiency and longer system life.