5 of 6 customers found this review helpful.
The pump manual comes with the following instruction
On presta valves with a removable valve core: Before use with pump, remove valve core and apply small amount of LOCTITE thread locker to valve core threads. Reinstall valve core and securely tighten.
To use this pump, you screw on one end of a flexible hose to your tire valve stem and the other end to the pump. After pumping when you remove the hose it rotates the same direction as unscrewing a removable presta valve core. Your valve cores will want to unscrew with the flexible hose instead of staying in the stem. You may need to use pliers to unscrew the core from the hose and it is easy to damage the small rubber seals on the valve core.
Even if you LOCTITE your own valve core stems it could be disastrous to loan this pump on the trail because another rider's valve core stem could get jammed in your hose, which leaves them without a valve core, and renders your hose and pump unusable until you can unscrew their valve stem.
The pump has unscrewed valve cores in several my Kenda and Q-Tubes brand presta tubes, I can't trust taking it out on the trails with my MTB.
I don't know of any problems using this pump with schrader valves but that's not what I bought it for.
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