I ordered this and a 4 port starter kit because I was doing a garage rebuild of my compressed air system. I removed all fittings from the tools and air hoses and opened up the first kit to install couplers and fittings for the air hoses and some fittings for the air tools. When I opened the box to complete the installation, one was missing. The fittings are very light and very breathable. Couplers allow you to connect tools like a U coupler where you simply slip the tool port into the coupler, which is handy when your hands are greasy and you are having trouble pulling the port back. In terms of long term use I use them in my garage at home so they don't take a lot of abuse so wear and tear is likely to be very limited. I love the purple color and they pop out when in the tool box drawer. would like to return them all and then send a new box but I installed the fitting I was given and it is still needed to complete the job.
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