Putting gasoline into most vehicles is easy—at the pump. The nozzle goes into the filler neck, you pull the trigger. Take away the pump, and it gets considerably trickier. Dirt bikes, tractors and construction equipment must be filled with gasoline or diesel in the field, from portable containers, and the filler necks are often in highly inconvenient location. The filler necks on tractors, for instance, are often in the center of the hood: To fill it, you need to lug a five-gallon gas can up onto the operator's platform, then lean forward and hold the can out in front of you to pour. Five gallons of diesel is heavy and takes a lot of time to pour it. It's easy, as your arms tire, to spill fuel all over the place. One solution is to raise the tractor's loader arms so that they're parallel with the ground, then lay a 2x4 across them on which to rest the gas can. Another solution, which many tractor owners invest in, is to buy a battery-powered pump that allows you to leave the gas can on the ground and run the fuel up through a tube. However, that's a lot of trouble to go to, just to fuel the vehicle. So Tuff Jug, an Idaho-based gas can manufacturer, designed a better solution for their titular gas can. The company's Ripper Cap was designed for fast, easy fueling. The Ripper Cap features a spring-loaded nozzle. All you do is invert the can, set the nozzle into the filler neck, and press downwards. This depresses the nozzle, which starts the fuel flow. The nozzle also has a built-in auto-stop feature. Here's how it works: It's easier than manually holding a gas can, and doesn't require the battery-charging that a pump needs. It's also faster than both methods: With a pump, you can generally transfer about 2.5 gallons per minute. But the Ripper Cap has an internal vent tube that allows for fast flow; five gallons of fuel can be evacuated in just 42 seconds. Great design.

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