9/8/2023 0 Comments Air compressor hose fittingsThis doesn’t refer to the size of fitting on the end of the plug, but rather the volume of air the plug can handle. Plugsįirst off, there are different basic flow sizes, such as 1/4″, 3/8″ and 1/2″. Most couplers look the same on the outside, so let’s look at plugs first. I browsed several forums and found people contradicting what manufacturers were saying, and so I decided I’d only use data from the manufacturers of these fittings, rather than trusting what any individual claimed. What I found is that there is a lot of misinformation about what types are equivalent. I figured if I was confused, I couldn’t be the only person - I’d write a post that would hopefully straighten it out. Still, I was bothered by my lack of knowledge about plugs and couplers, so I started researching the topic, starting at Stuart’s post about compressed air nuisances, and quickly got lost down a rabbit hole. I got home, replaced the coupling, and had no problem inserting the plug. To make things easy, this time I bought a “universal” coupler and figured it should work. I just attributed it to differences in manufacturers and moved on. Yet it worked just fine in another coupler I had. Once, I purchased a male plug that I thought looked identical to every other plug I had in my garage - I even compared it to one I had brought with me to the store - but after I bought it home and tried to plug it into the coupler on my compressor, it just wouldn’t lock in place. I’ve had problems before, with buying quick connect air fittings. I figured the coupler had gone bad, so I turned off the compressor and decided I’d pick up a new coupler the next day. When I plugged one of the hoses back in, no matter what I did, I couldn’t make an airtight connection. I was moving my air compressor the other day and had to disconnect the air hoses. Common Quick Connect Plug Types (left to right): Automotive, Industrial, and ARO
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