11 LB R1234yf (R-1234yf) Refrigerant Gas

One cylinder, sized for the job in front of you. Mobile techs and general repair shops that take vehicle AC work as it comes do not need standing stock on a rack. At 11 lb it is a one-hand lift into a service van, and how long it lasts depends on the systems you see, so weigh every charge in rather than counting cars.

Diagnose before you charge. A system that dumped its charge will dump the next one, so find the leak, repair it, pull a deep vacuum, then weigh the charge in through your recovery machine. Being a single-component HFO, this gas carries no glide: nothing to fractionate and no liquid-charging ritual to observe. It is not a drop-in for an R-134a circuit, which is why the service ports differ.

Treat it as the mildly flammable refrigerant it is. Keep ignition sources clear, ventilate the bay, never braze near an open charge, and use leak detection and recovery kit rated for mild flammability. Operating pressures sit in familiar R-134a territory and nowhere near R-410A. Store the cylinder upright, secured and out of the sun, and order the next one while gas is still on the machine.