I just bought a house that has an Omnibasic water filter. I don't know when the filter cartridge was last replaced, but it's starting to drip water so I want to replace the cartridge and the o-ring. The cartridges seem to be pretty standard and easy to find, but I'm not sure about the o-ring.
The site recommends their U24 o-ring (http://www.h2owarehouse.com/u24-oring.htm). I could order this from this website, but I'd like to do it soon without waiting for shipping. I'm looking at local hardware stores (Home Depot, Lowes, and Menards) but not seeing this exact model. Does anyone know if this is a standard size, or any other names it might go under?