Connect an air line, this is page 2. Page one of connect an air line is here.
More than a few folks have asked questions about the process of connecting their air compressor to their air tool or air using application. These pages are in response to those questions.
The part of the connector that is surrounded by the white square is the method of connecting that connector to something.
The connector that inserts into the coupler on the air compressor itself is commonly attached to the air hose or an air line. In the photo, this is a male NPT thread inside the box. Your hose might also have a male NPT thread end, so you would either have to use a threaded female/female coupling to attach the connector to the hose, or you might opt for a female connector instead. The female connector would screw right onto the male thread of the air hose.
At the other end of the air hose or air line you would install another checked coupler, so that when the connector was inserted into the coupler on the compressor, air would flow down the air line, and then stop at the coupler.
Compressed air would not flow out of the end-of-hose coupler until a connector was inserted. And the connector inserted there would be commonly attached to an air tool.
This connector thread would also screw into the air supply port of your air tools. Each of your air tools would have a connector pre-installed, so when you wished to change air tools, you simply would slide the ring back on the coupler, out would pop the connector, and you would insert the connector attached to a different air tool.
It is easy to become confused, and few things are as frustrating as trying to insert a connector into a coupler that it is not a mating pair for. Sometimes, a mismatched coupler and connector may actually connect. The result can be lower air flow and ongoing leaking.
There are varying qualities of connectors and couplers (the cheaper ones tend to leak if there's even a bit of side-load) yet for us DIY users, cheap ones are usually OK.
My advice is to find out when you buy your compressor what type of coupler and connector comes with the kit, and purchase a bunch more of that same type at that same time, and don't ever have any other brand around in the shop or tool box.
As a general rule you will need many more connectors that you will couplers. I have a connector threaded into everyone of my air tools so that I don't have to go looking for one when I want to use another tool.
You have an air tool with the correct connector threaded into the air tool air intake port.
How do you connect the discharge coupler on your compressor to the air tool?
You will use an air tube or air hose. Since the difference between the two is well documented on this website, visit information about air line hose.
Into one end of your air hose you will install an air connector, and into the other and air coupler.
The connector on the air hose inserts into the discharge coupler on your air compressor.
The connector that you have already inserted into your air tool(s) can then be inserted into the coupling on the other end of the air hose.
The coupler on the air hose is checked. Air can flow into the hose, but unless a mating connector is inserted into the coupler, no air can flow out through it.
And that folks is how you connect an air line from the compressor to your air-using application.