CulliganOR-34 O-Ring of 4.125-Inch Diameter 2-Pack

I have the HF-360A and have heard rumors that the "A" version o-ring "OR-34A" is not the same diameter as the OR-34 for the older housing. I don't know if this is true but Culligan sells an OR-34A set with two sizes one of which you will not need. This product appears to be the proper size for the "A" housing as advertised, 4 1/8" diameter measured by me, and looks exactly like the original o-ring. It is the best value I have seen. I ordered four and was charged the same shipping rate as for one and they came in a single zip lock bag. Nice to have spares in case you pinch one with a misaligned installation.The o-ring appears to belong on the step above a circular groove in the housing that is smaller than the o-ring. My first attempt to screw on the housing resulted in the o-ring falling down into this groove causing leaks and possibly being damaged. I urge you to use a silicone grease like Dow Corning MOLYKOTE for several reasons: it will hold the o-ring on the step as you install the housing, it provides lubrication, it slows down leaks.

These O-Rings work perfectly in my water filter.The fit is perfect. Not too large, not too small.THe only thing i can recommend HIGHLY when installing these... use vasoline.Coat the entire O-RING in vasoline and then put it in and then put on the top. I also put vasoline on the threads of the cap for the water filter too.The vasoline on the o-ring holds it in place better and it helps make a better seal.With vasoline on the threads of the filter cap, not only does the cap go on more easily and come off more easily, but it has a great seal AND... i don't have to put the cap on as tightly.

I have two whole house filters, and have had them installed for a number of years. Never changed the original rings till I got these in. Now the first set were still good as far as I know. I never had a problem with them, but thought it might be a good idea to go ahead and change them.The filters I have are the Culligan PF 160's( I think), and these fit fine. I installed them, and the install went on without a hitch. Afterward no leaks, no problem o! Now, these should last for years, and since there were two in the package, and I got two packages.....I shouldn't have to order more in my life time! Sorry Culligan!BTW....I LIKE this item. I don't LOVE IT.....I love my wife. :)

I found these after some searching on Amazon. I replace these once a year on my Culligan sediment filter, and I couldn't find them locally at Lowes or Home Depot.Note that you get two o-rings, but you can only use one, as they are different sizes. Be sure to look at the directions and match the filter type. The other o-ring ends up being a throw-away item, unfortunately.

Used aquaphor (like vaseline) to lubricate lightly and install. Works great

Had to replace some orings on a filter housing. This pack came with two sizes and luckily one fit.

Fits my ace hardware whole house filter. No leaks!

I only trust the Culligan brand for my residential water filter needs. This part works great and if you use petroleum jelly on this prior to installation it will last you for a number of water filter changes!UPDATE 8/23/13 -- I have since switched to silicone jelly lubricant and I notice now that these O rings last much longer!

Very poor quality ,leaks after 1 month

Worked like a charm -- just make sure you match your Filter model to the O-ring. Only the "B" ring fit, the "A" ring seemed too small, although they're apparently the same thing.