In measuring for a new Oring, do you measure from the inside, outside or middle? I'm looking at my water filter and need a new ring. The ring is about 4" but 1/8" thick. So that would be about .25 difference between inside and outside. I know smaller would stretch but just wondering.
Go on to the website of any online water filter store. They all sell o-rings. Most of the time, when you order a single o-ring by size you get a bag of assorted o-rings. In the bag will be an o-ring that will fit your water filter. It is just as cheap to buy the o-ring "kits" as it is to buy a single o-ring and then you can give the rest of the bag to someone who uses a different brand filter than you. I currently have 5 or 6 unopened bags of o-rings in my garage. This way I have o-rings for my well filters and my trailer filters. Randy
I have always just taken in my old o-ring to Home Depot and found a perfect match... But, these guys have every 0-ring under the sun listed by filter name and manufacturer....
Smaller may stretch, but then it might be too thin to seal properly. The O-ring should have its size listed: OD, ID, and/or thickness. IOW you might find ID and thickness, or OD and thickness.
