Check the listing for details. AO-WH-LG-OR O-Rings for AO Smith AO-WH-PREL Whole House Water Filter (3 Pack). Color: Black, Condition: New. Listed at 12.99 USD. AO-WH-LG-OR O-Rings for AO Smith AO-WH-PREL Whole House Water Filter (3 Pack) Product Features: AO-WH-LG-OR (also called 1074315) - Large O-Ring measures approximately 5.48” Inside Diameter and 0.165” Thickness (approximately 14cm ID). Compatible with A.O. Smith AO-WH-PREL whole house water filter housings. Often referred to as “Large 4.5” O-Ring” because it is compatible with the AO Smith AO-WH-PREL filter housing that uses 4.5 inch wide filter cartridges. Not compatible with the smaller “standard” AO Smith housings that use 2.5 inch filter cartridges. Includes three (3) o-rings (also called gaskets or seals). OEM spec Buna-N rubber for long lasting performance and reliability. An exact match to the o-ring that came in your filter housing when it was new. Manufactured and warrantied by Captain O-Ring LLC. Proudly assembled in the USA! Get your leaking filter housing back in working order with Captain O-Ring’s replacement AO-WH-LG-OR o-rings. The AO-WH-LG-OR o-ring is compatible with A.O. Smith AO-WH-PREL whole house water filter housings. The AO-WH-LG-OR is often referred to as “Large 4.5” O-Ring” by the manufacturer because it is compatible with the AO Smith AO-WH-PREL filter housing that uses 4.5 inch wide filter cartridges. This o-ring size is not compatible with the smaller “standard” AO Smith housings that use 2.5 inch filter cartridges. Package includes three (3) o-rings. Replace your leaking o-ring and have spares on hand for the future with this handy 3-pack. OEM spec Buna-N rubber for long lasting performance and reliability. An exact match to the o-ring that came in your filter housing when it was new. Manufactured and warrantied by Captain O-Ring LLC. Proudly assembled in the USA!