instead I used O ring out of a box of O rings that fit better.
919544
Well basically I paid $23 for 2, 5 cent O rings.had there been a picture or part listed I would not have purchased. I did not use them, instead I used O ring out of a box of O rings that fit better.
1433300
I just got this oil thermostat, and I am having a devil of a time finding the correct connectors. It is listed as having -10AN O ring fittings, but all of the -10AN O ring fittings I have bought: Frangola 494002-BL and Russell 670710, have fit very loosely and the O ring does not seem to be large enough to form a tight seal. I am having to resort to massive amounts of teflon tape and I'm not feeling real good about running this in an endurance race.
2778699
The O ring fit perfectly and its great that it came with multiple O rings, so I have back ups now.
20367
The replacement DE bulkhead for a Pentair filter is a good upgrade from the original. It does require a different o ring than the original. Sadly the one suggested on Amazon is for a sand filter and to large for the DE bulkhead. I had a #333 O-ring on hand and it worked well. Trying to find a way to get Amazon the info on the wrong suggested O-ring, but until I do I hope a few will read this before the order.
2887636
When it arrived the o-rings inside were all twisted and crimped, one was even cut.  Went to the local hardware store and purchased new o-rings and now everything works.  Doesn't line up straight but still works. Inspect the inside o-rings if you purchase this item
1411764
leaks at O rings use your old O rings to prevent leaks
2515724
Works but as others have said have an assortment of O-rings around.  The ring on this was HUGE and luckily I had one I could use in my O-ring kit.  Maybe it should be sold with a few different O-ring thicknesses?
3066262
These boxes are hit or miss when it comes to the fit of the pieces. Mine was pretty sloppy and required 14z of silicon caulk to make it reasonably water tight. The lid doesn't align well with the box so I used a zip tie to secure the lid for the winter. There is a lot of slop in the manufacturing tolerances for this product. But, I made it work.

I have several other Rubbermaid sheds that fit together tighter but I still caulked them, too.
3128305
This o ring fits; however, it is not quite as thick as the original o ring. A plus is that it is easier to remove the lid from the chlorinator, the down is that it allows for a very slight leak. The is very small so no problem.
1483410
DO NOT FORGET TO PUT THE O-RING ON THE PCV VALVE CONNECTOR when you attach it to the back of the intake!!!  I made this mistake and had a bad vacuum leak that took several hours to trouble shoot, then had to pull air intake back off to fix it.
Overall a pretty decent product, but not as nice as the Ford part (but half the cost) and the self tapping screws are sort of a pain.
2871020
O rings provided didn't create a watertight seal. Would still work with a welded bulkhead, but that isn't what was advertised.
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.
659123
When I swapped this filter for the OEM one, the fit wasn't exact.  This one is about a quarter of an inch too narrow in my 2006 Lexus RX400h, plenty of room for debris to pass by the filter.  Also, even though the box wasn't damaged, two of the corners were bent and cannot be straightened.  I will upload a picture of a bent corner.
2558235
The "O" rings are two big but if you have your old filter take out the "O" ring on that one and it will fit fine.  I'm going to give a 5 star because I saved the old "O" ring.  If you threw your old filter away and didn't scavenge the part I referenced, probably a 3.
1278477
The ACDelco 15-1605 A/C Accumulator Assembly included two large "O" rings for the main inlet and outlet. No problem there. However, the smaller connection for the pressure switch did NOT include a new "O" ring. The buyer should NOT be expected to buy a new pressure switch in order to get a new "O" ring. This is not reasonable. I was forced to use the old "O" ring because of the difficulty in finding a single "O" ring. I would not suggest a person pick up a generic "O" ring at the hardware store because it may not be compatible with the compressor oil and refrigerant. I will charge the system tomorrow and revise this post if the old "O" ring leaks. Otherwise, it worked.
On the positive side, the external welds are awesome in visual appearance. I nearly pass on this order because the body weld shown in the picture is grotesque.
I prefer authentic ACDelco products for my 1986 Camaro Z28, so this order was a major disappointment. I would have given a 5-star rating if the "O" ring was not missing.
166723
Decent kit but definitely not for my M20. Fortunately the o ring did fit which was what I really needed but nothing else fits the carb. Cheap enough so I simply tossed the other parts
1849633
Definitely a better price than the OEM replacement, but the fitment/size is a bit off. Very hard to get the initial fit in. Once it's finally mounted however, it works fine.