Ineeded a few extension Pu Air Hose for my air compressor to finish a built-in on the far end of my house. Choosing a hose that works well is not a trivial matter. Here is a guide for how to choose the best air hose for your application.

What matters
There are three main issues to consider when shopping for a hose:

Length: The obvious one on the list; the hose needs to be as long as you need it to be.
Sizing: The inner diameter of the hose will determine the maximum amount of air it can carry.
Material: The material the hose is made from determines how flexible the hose is, and how long it will last.
Length
Hoses come in different types to improve usability. There is no hose types that performs best in all applications. A 100ft hose will reach everything you'd ever want to reach, but it would also be much heavier and bulkier than it needs to be most of the time. Short, lighter hoses may be a better option for smaller jobs. At some point it becomes easier to move the compressor than it is to move the hose.

If you have the room, the pair of a short hose for shop work and a long extension hose for occasional jobs is a good loadout for your toolbox.

Sizing
The inner diameter and maximum pressure rating of a hose determine its capacity to deliver air. Larger diameter hoses operating at higher pressure deliver more air. Most handheld tools such as nail guns and sprayers can be adequately supplies through a 1/4" hose. 3/8" diameter hoses are only necessary on runs longer than 100ft or when a large air tool is in use.

Keep in mind that bigger hoses weigh more, which will affect handling of your tool. On spray guns in particular, using a light hose will increase the user's dexterity.

If you swap hoses regularly, the diameter of all hoses should match. If the hoses do not match, the pressure at the tool will change wildly as one hose is swapped for the other. A quick adjustment at the regulator will fix the problem.

Material
The material the hose is composed of will determine its performance. Each material performs differently under differing circumstances. The air delivery capacity is the same for all these materials. Let's take a look at the different materials.

Rubber
How to choose a Hose for Compressed Air
Rubber hoses are the traditional choice. Most hoses in use today are made from rubber.

Rubber hoses lie flat, won't kink at all, and are easy to coil. They remain flexible in freezing conditions, but do not perform as well as polyurethane hoses in this environment.

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