VANSIHO Bike Brass Presta Valve Adapter, Converts Presta to Schrader Inflate Tire Using Standard Bicycle Pump or Air Compressor (5 Pack)

Despite numerous attempts, I couldn't tighten them enough to prevent leaks during tube inflation. The leaks occur only while pumping air and not at other times. I resorted to using the nozzle adapter on my pump, which works well.

My wife and I both have mountain bikes setup tubeless with presta valves, so I'm always needing these adapters when I check and set the pressures. I do not keep these adapters on all the time, only when I need them. I bought a pack of the "Slime" brand adapters a few years ago and over time, I seem to only have one left! This pack of 5 adapters should last me a while!Comparisons to the Slime adapters:-Slime adapters are threaded all the way through on the inside, vs only threaded at the base and smooth through the neck like these-Slime adapters have a more complex knurling patternThese adapters work great and seem to be decently made, so we'll see how long they last (or how long until I lose them!)