These swivels rotate on two axes and allow your air hose to reach your air tool's air input port from any angle without binding. This means you won't have to fight the stiffness of the hose while trying to hold or position the air tool. Once you have these, you'll wonder how you got along without them. I've installed them on almost all of my air tools. Make sure when you order these swivels that you order the correct size for your tool. They come in 1/4", 3/8" and 1/2" NPT. These sizes refer to the inside diameter of the fitting. The most common size on hardware store air tools is 1/4". The larger sizes are found on tools requiring substantial airflow to operate properly like large grinders.
Also make sure if you have a high-flow air tool that you aren't using the tiny quick-connect fittings that seem to be the default on most hardware store air tools. These fittings have only a 1/4" air passage and will restrict the airflow and performance of a high-flow tool. You should also be using a minimum of 3/8" ID hose (1/2" would be better) with the bigger tools if you want the performance you paid for. I use the 3/8" (P-Style) quick connectors on all my air tools and I use 1/2" hoses for most applications.
Note that there are knock-offs of these connectors made by Dyna-Flo and some no-name manufacturers. While Dyna is a quality manufacturer of air tools, their swivel connectors are made of plastic and won't last as long as the Milton brand which are machined from billet aluminum. The others fail and start leaking at the seals in even light-duty use. I'm replacing them all with Milton brand when they fail. Buy the Milton's and you'll be happier in the long run.
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Product Description:
Milton Air Hose Swivel Connector 3/8 in NPT Allows 360 degree swivel in two places to prevent hose kinking . Female pipe threads connect to most hose fittings. Not for use with percussion tools .
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