You cannot get this pump head mechanism to slide and lock onto presta valve stem without excessive force. It's impossible to operate with frozen fingers. Looking for a new, easier to operate, pump to replace it. Pump was used on Fatboy.

Only high volume minipump I could find. Use it for 26x4,8"" fatbiketires. In about 100 strokes it will inflate from about 0,5 bar to decent pressure for road use, in my experience. Very helpful when fixing a flat during a trip. Aluminium body is durable and the head works well with both Schrader en Presta valves . I keep it in my framebag, dry and clean. Good product

Used now for a month on a 27.5in freeride/dh set up. Works as it should, havent had any problems getting on and off the stems. Also it has a pull out hose that gives you like 4 inchs to make it easier. Lbs guy didnt even know it until i pulled the hose out. Not a big fan of the offset mount but what ever.

I find the connection to the valve hard to remove sometimes. Mine is 6 months old and it just gave up the ghost on schraders, just will not get air into the tube. Back to the LBS it goes, hopefully I can exchange for something else. To my mind using a threaded connection would make a lot of sense.