The o-ring is specifically made to fit standard 2.5" filter housings and measures 3.44" (9 cm) in actual size. It is compatible with the Whole House Sediment Filter (AO-WH-PRE or AO-WH-PREV).
Keep the water-tight seal on your whole house sediment filter.
Use only certified, genuine A. O. Smith replacement filters for continued contaminant removal and system performance.
Replacements made easy - use when you change out your filter every 3-6 months.