On another site I asked what kind of O-rings would be best for this application. One of the guys works in high pressure hydraulics and posted this Parker pamphlet. Parker pamphlet In real-world attainability It would be a choice between VITON or BUNA-N. The BUNA is less expensive but better sealing at lower temperatures. The VITON is more chemical resistant. HNBR is very high temperature and chemical resistant and is what they use for R-134a systems. All would be good for moderate temperatures, low pressure, and ATF resistance. In hydraulic world our 350 psi system is very low pressure. Can you guys remember what material you used? I am going to try to post a pic of the sealing assembly. [img]https://firstgenfirebird.org/forums/ubbthreads.php/ubb/download/Number/20179/filename/IMG_0557.JPG[/img] Hmmm, no good. You have to click on it. Every site is different I will keep trying.