Blackburn Outpost HV Anyvalve Mini Pump. The Blackburn Outpost HV Anyvalve mini pump is just what you need for on the go inflation needs, especially if you're on a fat bike or a bike with plus size tires. The Outpost HV Anyvalve just happens to provide the largest air volume of any mini pump on the market so it's perfect for efficient inflation of high volume tires. Its anodized aluminum construction is extremely strong and durable plus it's designed to work in temperatures down to 40 degrees Celsius. Additionally, there's optimal versatility as the Anyvalve Pump Head works with Presta, Schrader, and Dunlop valves.