Review on IDMAX Portable Bike Pump - Foldable Mini Hand Air Pump for Mountain & Road Bicycles, Compatible with Presta & Schrader Valve - High Pressure Tire Inflator by Tay Tran

Incredible waste of money and a complete POS! The valve head will not fit the Schrader valve stem in any configuration. The air hose entering the valve disc assembly is not tight enough and blows air directly through the space between the hose and the valve disc assembly. Simply place your finger on the end of the valve head and pump, and all air will escape through the free hose connection to the valve head assembly. You can easily insert the end of the hose into the head assembly and remove it when everything is tight! Worst product I have received from Revain in years!