Review on 🚴 BWSHLF Tubeless Presta Valve Stem Kit - 40mm / 44mm, Super Lightweight Alloy, Includes Value Core Remover Tool and Valve Stem Caps - Multiple Color and Size Choices (Pair) by Tim Rios

These valve stems did exactly what I needed. I mounted them on an e-bike rim that was drilled for Schroeder. I went tubeless and the valve stem I was using blew the valve hole. This valve has a metal flange under the gasket that prevents passage. It is perfectly sealed and the caps have a built in valve core removal tool. The holes in the bottom of the valve stem are more than enough to fill up the sealant. The only issue I had with installation was when I installed the locking ring, I forgot to slide the valve stem base through the tire. I accidentally threw the stem back through the hole in the tire and had to push the bead out to get it out. Lesson learned. With hope. I will buy them again for other tubeless conversions.