BV Bicycle Floor Pump with Large Gauge, 160 PSI, Reversible Presta & Schrader Valve with with Thumb-Lock Lever The ergonomic design of this floor pump and large stable foot makes handling the pump easier and quicker The large base is 9.13 in long The gauge is 1.81 inch in diameter Twin-valve, reversible Presta and Schrader, with thumb-lock lever Easy to switch between valve types - just untwist valve head and turn it around!