Estoreimport &copy; Lot 5 Pcs New Presta to Schrader Pump Bicycle Bike Valve Adaptor Convert Repair Lot 5 pcs New Presta Valve to Schrader Pump Bicycle Bike Valve Adaptor 1 YEAR WARRANTEE AGAIN DEFECT. Brand new and high quality. Light, easy and convenient to install. Convert a Presta valve to a Schrader valve. Also turn a UK valve into a US valve. Material: zinc alloy (copper plated). Size: 1.5cm x 0.9cm. 5 x Valve adapter.