The MSR Arctic Fuel Pump is specifically designed for use in sub-freezing temperatures. While the Standard MSR Fuel Pump may struggle in the cold, often due to the seal and pump cup becoming stiff, the Arctic version is built to handle those chilly conditions. However, it's important to note that the Arctic Fuel Pump should not be used in temperatures above freezing, as the rubber seal might soften and lead to leaks. Unlike the Standard model, the Arctic Fuel Pump features a leather pump cup and special O-rings that remain flexible in cold weather. You can use the MSR Arctic Fuel Pump with all MSR liquid fuel stoves, except for the DragonFly stove. Please use it only in temperatures below 0° C (32°F).