What size O rings for the receiver drier?

[Bigot Bledsoe]

I purchased a universal O ring kit and none of them are the same size... what size o rings should i look for?

 

[VIPER PIT]

I used the same size o-ring inside diameter from that kit. Just look for the one that is a little thicker because as they age they dry out and tend to get skinny and leak. There should be a paper in the packaging that has the actual profile sizes on it. Use that as a reference.