Here's what other sites are saying:
Ensure you can heat up your food when you need it the most with the MSR Arctic Fuel Pump. This pump works on all MSR liquid-fuel stoves with the exception of the Dragonfly to bring a steady flow of fuel to your stove in the coldest of conditions.
The MSR Artic Fuel Pump is a liquid stove pump for use in temps below 32°F. Compatible with all MSR liquid-fuel stoves (*except the Dragonfly;), so you can cook up a hot meal in freezing temps without trouble. Beefier seals to prevent leaks. Fire it up and hot water, coffee, dinner and more is on its way to your gullet. Features of the MSR Artic Fuel Pump Designed specifically for extreme arctic temperatures Seals and pump cup remain flexible in sub-freezing temperatures
Current Retail: $41.95-$49.95
Historic Range: $36.96-$67.90