While many people may not understand the importance of having a manual siphon it's uses are endless.

A hand pump is essential if you have stored water in a large container that does not have a large enough opening in which to dip water. Furthermore, dipping water out could contaminate the water source, whereas you can sanitize the siphon for drinking water only rather easily each time to prevent contamination of the source.
A manual siphon only requires a small opening, which also lessens the chance of contamination. Some of the larger water barrels may not have a lid that can be removed. They may only have a cap for filling and extraction. Removing the entire lid greatly increases the chances of contaminants getting into your drinking water source.
You, of course, never want to use a siphon for drinking water that was ever used (even once) to siphon any fuels or chemicals regardless of how well you think you may have cleaned it.
What can you do with a hand siphon? You can siphon gas from a gas can without a spout into a vehicle, or in some cases siphon gas from a vehicle into a gas can or another vehicle. If the grid fails gas pumps will not work, but yet there will be many vehicles, and underground fuel storage tanks, but you must have a way of extracting that fuel for your use.

Think about siphoning water, antifreeze, bleach, gas, and any number of chemicals! While others will be working with makeshift funnels, jeopardizing themselves, you will be the safe one with a manual siphon pump.  If you would like to purchase one you can do so [ HERE ]