What's in an O-Ring? It fits well, seals ...
353791
What's in an O-Ring?  It fits well, seals well and delivery was timely.
1127754
My refrigerator has always had an o-ring on the filter. No mention of this in the instructions and it seems to fit a little differently but it worked nevertheless. I did not try it without the o-ring, so not sure if it's even necessary with this filter.
4092615
It fits well as expected. I used these for a home made 2 liter bottle rocket launcher. The o-ring held the water in the 2 liter bottle as I pumped air into it. Sometimes the o-ring would tear. But hey, for 100, is still a good deal.
1827310
fit fine, however, already degrading in the chlorine canister.  this is what happened to my original o-rings.  they seem to only last a year max. so keep extra on hand.
1991545
Part fit like original and came with the right O-ring.
959622
Water started coming out of the base of my kitchen faucet so I knew the O rings needed to be replaced. You get three rings, but I only needed the two smaller rings. It comes with the lubricating grease. Fits/works perfectly.
4118467
this o-rings fits perfect and never had a problem with it. haven't had a leak so far. the gun already shot 20k of balls.
2021223
With a bit of Teflon tape I got excellent seals.
The push-to-fit is tight,  and the release ring easy to operate.
Good deal on quality fittings
2814357
This works very well.  I had it leak once, I just have to make sure all of the O-rings are tight!  They do tend to come loose over time.
849628
Its an O-ring.  Looked like an O on Amazon got to the house.  Still looked like an O
191649
Perfect fit, nice seal, high capacity - this was my 2nd replacement, the oe and 1st replacement lasted me to 250k
1375967
Very good - this appears to be the proper OEM part. It's correctly stamped with part number and forms a perfect watertight seal.
2394432
This large o-ring was a perfect fit for my pool filter housing.  When installed, it sealed my leak issues and everything is now dry around my filter and pumps.  Fast shipping and a perfect fit .... can't get much better than that.
4195315
Fit is good. It should come with a temp sensor o-ring but doesn't. I installed it on a 2000 Golf 2.0 AEG. Used some water pump silicone in addition to the main o-ring. No leaks yet.
2889504
Product description states that this is an "exact replacement", but alas it does NOT come with the o-ring.  You'll need that!  I am now unable to use the new diaphragm until I order another replacement that does come with the o-ring.  How hard would it have been to add a note stating that it does not include the o-ring?
2775624
More O-rings than i can use, but man what a deal!! This kit has a bunch of sizes and will last me 10 years I think!
3867428
Fits and seals great. I used the rubber seal from the filter kit I bought. The one with the pan seemed pretty cheap. Only minor thing was it has a small dent on the bottom of the pan.