Product reviews:
Schrader Valve Adapter Gold - Ace Hardware presta to schrader adaptor
presta to schrader adaptor
Schwalbe Valve Adaptor Presta/Dunlop presta to schrader adaptor
presta to schrader adaptor
26PCS Bike Pump Adapter - Schrader presta to schrader adaptor
presta to schrader adaptor