Tuning FX Impact slow leak after installing Huma Reg

[Powerage]

I just replaced the regulator in my impact mk2 with a huma high pressure regulator . To my surprise next morning the tank was empty . The plenum still holds air 160 bar on the reg. I tried to locate the leakage using leak spray but I can’t see any bubbles around the regulator . Any suggestions what o-ring I should replace ? 

 

[biohazardman]

Don't know if you checked for leaks at the weep hole right side above the grip. The reg can leak there too.

https://www.airgun101.com/component/allvideoshare/video/fx-masterclass-impact-maintenance-regulator-pt-1-5-7?Itemid=381

https://www.airgun101.com/component/allvideoshare/video/fx-masterclass-impact-maintenance-regulator-pt-2-6-7?Itemid=381

 

[Powerage]

Thank you for the reply . The weep hole is fine. No leak. Think I might have to order a o ring kit for the huma reg