First time I fitted these valves I thought I had wasted my money, the stems were too short so that the nut only just caught the first couple of turns on the threads. This meant that my pump just fitted, but my pressure gauge was too deep. ( bontrager rims on a 2021 Trek Fuel EX8 )
So I took them out and thought about it for a week, tried again the following week and realised the red wedge shaped seal was not going into my rim enough, so I replaced it with an O ring, allowing the stem to sit 5mm further into the rim. Been running them successfully ever since.
I cut the top off of a plastic valve cap and stuck that onto the end of my tyre sealant syringe, as the tube that fitted inside a standard stem was too small to fit over these.
So a bit of adaption needed to make them work, but I’m very happy with the result, I just hope I do not lose a cap as replacements do not seem to be available.