Review on 🚲 Topeak JoeBlow Sprint Bicycle Floor Pump, 160 PSI/11 BAR, TwinHead by Dan Worku

This pump seems well built but I don't use it. I would recommend this pump to any bike owner who is serious about inflating tires accurately. Update November 2017: After years of non-use I find this pump more than useless! I'm not a gifted mechanic, but I'm not a mechanical idiot either. Using a bike tire pump shouldn't be that difficult. Remove the bag from the bicycle tire valve, insert or screw the pump connector into the tire valve, inflate until the correct pressure is reached, quickly disconnect the pump from the tire valve. But with this pump, you can instantly deflate a bike tire. What am I missing here?