CAT 256-8753 Seal

Hello, I purchased a new cat fuel water separator with the small oring or seal that goes on the threaded filter base. This is my third or fourth time breaking this oring over the years. Can anyone give me a replacement oring part number or alternative? Tired of throwing away filters due to not having the replacement orings.

 

I just posted a picture of the actual filter. This is the primary filter that sits on the frame rail. I have broke 3 or 4 of the rubber seals that go on the filter base and had to pretty much throw the filters away because I couldn't get the oring. Im sure someone else has had this issue. I will also post a filter with the small oring attached to the drain valve.

 

No, I remove the old one and replace it with the new one. I've had several to rip whilst trying to get it over the threads. I'm scratching my head too because I'm sure I'm not the only one that has had this happen. You must have that Midas touch. Please tell me what im doing wrong. I've been trucking as an owner operator with cat engines for 27 years. While this isn't an every fuel filter change occurrence. It has happened. Just trying to find the small replacement oring is all.

 

Thank you for the installation insight. I also do this. It seems to be more of a hassle during the winter months as this happened again a few days ago in Ohio at -6 degrees.

What i am looking for now is that little small o-ring seal or a part number so I can purchase some spares.