Kool Stop Presta to Schrader bicycle pump adapter - BRASS (EACH) KS-POB
KOOL STOP Presta to Schrader tube valve pump adapter
Great to keep one in your toolbox or run two on your Presta tubes at all times to be sure you can inflate regardless of pump type you have.
Part number: KS-POB
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Turns smoothly, easy to grip, completely seals the valve. It has a job and does it well. Don't torture yourself with some cheap plastic piece of crap.