Compressor fittings come in NPT and metric sizes, with different styles like straight, tee, and elbow connectors. NPT sizing refers to the taper of threads, while metric sizing is not available. Quick-disconnect fittings save air supply, high flow fittings are best for sanding, and swivel fittings are used on pneumatic attachments. Automatic oilers extend air tool life, and rotary fittings allow easy storage of air hoses.
There are several types of compressor fittings in both National Pipe Taper (NPT) and metric sizes. There are also different styles of compressor fittings, from straight and tee types to elbows. NPT compressor fittings are not sized based on the diameter of the fitting opening. The sizing of these fittings instead refers to the taper of the threads. Sizes are based on a scale in inches, with size represented as a fraction of an inch. There is no metric equivalent in this sizing style.
Some of the more common compressor fittings consist of straight and elbow connectors. These compressor fittings are used in a variety of ways, from connecting an air hose to the compressor itself to connecting a pneumatic tool to an air line. Many times, compressor fittings are a quick-disconnect design, allowing you to connect and disconnect an air hose from an air line in seconds. By utilizing a quick release style compressor fitting, the air supply stored within the compressor air tank can be saved rather than depleted whenever the air hose is removed from the air tank.
Some fittings are classified as high flow fittings. These fittings are best when a task, such as sanding a vehicle, will require a large amount of air delivered at a constant flow rate. Some fittings are known as swivel fittings and are used on air tools and other pneumatic attachments that may require manipulation of the air supply line. Other fittings are specifically designed to connect water filters and oil separators to the outlet side of the air supply. These allow you to spray paint without forcing water vapor or oil into the paint job.
On an air compressor that won’t be used for painting, an automatic oiler may be a desirable accessory. This device mounts to a special fitting on the compressor and delivers a constant oil mist in the air stream. This is used to extend the life of the air tools used with the air compressor. This also eliminates the need to oil air tools before and during each use. One of the more useful compressor fittings is a rotary fitting that allows you to wind an air hose onto a hose reel to pull out for use and roll back up when not in use.
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