O Ring for Pentek 20-ST

[mcings]

My o ring is damaged on the Pentek 20-ST I bought last year. I desperately need to know the size of this o ring today so I can get my water back on. Please help.

[waterfilters]

Here is the oring you need and the size is listed:
OR-34 O-Ring, Culligan OR-34 O-Rings, Pentek OR34 ORing Gasket, American Plumber W34-OR to prevent leaks

It's a good idea to have one or two spare orings and also oring lubricant on hand:
O-Ring Lubricant and ORing Silicone Grease - Dow Corning 111 Sealant to lubricate water filter o-rings

The 20-ST is located here for future reference:
Whole House Water Filter Housings 150166, 150069, 150071 from Pentek, USFilter, and Ametek

Thank you,
WaterFilters.NET