Review on LEZYNE Dual Valve Alternative Bicycle Pump Head: Presta, Schrader, & Dunlop Compatible for High-Pressure Tire Floor Pumps by Eric Ross

I bought this to replace the double ended cap screw that came with my Lezyne pump thinking it would be easier to use. I've been misled The Schrader valve side was a total waste of money. It takes a lot of force to put it on the valve and seal it. It is useless if the tube is new and there is no air in it as this will push the valve into the tire. In general, this is a coincidence. I called support and they recognized the problem and offered nothing but a lack of care or sympathy. "We are aware of this issue." I had to reattach the metal plate that came with the pump to get my pump working properly again. Don't buy this.