Its a DIY thing. I wrote it up here. This is the only 48v pump I could find. Weighs basically nothing. Since I always have a set of panniers on any bike I am riding this just lays flat on the bottom of one of them. on my EMTB I can fit it into my handlebar bag with room to spare. It has soooo saved my ass on more than one occasion now I have just said to hell with it and its now a permanent part of the luggage.What brand/model?
In particular: a freaking strip of roofing nails a couple of months ago. Good luck with co2 or a pump getting air back in faster than a dang half dozen nail holes right in a row. 4.8" fat tubeless tires on a loaded cargo bike coming back from Home Depot. I needed three refills (ride a block, refill. Ride another block. Refill) before the sealant - FlatOut - got settled in, and the tire is still holding to this day.