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Things I liked: Well machined part
Things I would have changed: A little thicker O-ring for a tighter fit
What others should know: I thought I had a problem with my original probe because I couldn't get the airgun to pressurize. The probe seemed loose at the air pump adapter connection. I compared dimensions between the pump's test plug and the probe and the fill probe seemed to be machined undersized. I called Pyramid .and they quickly sent me a new one at no charge - same loose fit as the original. After going back and forth with Pyramid several times, I asked if they'd had any other issues with the fill probe. They hadn't. Final fix was that apparently I hadn't lubed the probe's o-rings quite enough and they weren't able to seat properly. Note: Lube the o-rings! Lesson learned for an old newbie to the PCP club.