I have been searching unsuccessfully for an o-ring for the Andair 375 fuel filter. I want to have a spare in case one is needed following cleaning of the filter. Anyway, I ended up ordering from Andair in England, and found out if you order using their web ordering system, they ship using Fedex for 15 pounds! If you order by phone, they can send by ?post.? Takes about a week, but is significantly cheaper. Also, Gary at Van?s says he is going to try to get Van?s to stock them, since so many of us now use the Andair pump.