Whether you are a moto-crosser, snowmobiler, ATV'er, or simply obsessive compulsive car driver (I guess I am in the last category), you know it is good to have a funnel around in case you need it for fuel, lubricants, or other fluids. A funnel helps you prevent spills, minimize messes, and reduce waste.
The top bowl of this funnel is about 5.5 inches in diameter. It has an easy to grip handle. The large bowl's output port is about 1.25 inches in diameter and screws into a one foot long flexible neck. The input on the flexible neck is approximately 1.5 inches in diameter. The funnel is made of strong, slightly flexible plastic. I keep it in the trunk of my car and I don't worry about it breaking.
Normally the two pieces of the funnel would be used together. However, depending on your need, it may be better to use either the large bowl or neck separately.
If there is a high probability that you might get stuck in a place with low quality gasoline or if you use a gas mower and your fuel sits around for a long time, you might want to look into http://www.mrfunnel.com/
Though I don't use it very often, I am happy to have a Shop-Craft Multi-Purpose Funnel just in case.