Compression Springs are open-coil helical springs that offer resistance to a compressive force applied axially. Compression springs are used to resist applied compression forces or to store energy in a push mode. These compression springs are used in automotive, aerospace and consumer applications. Compression springs are a straight cylindrical spring made of round wire. Compression springs are wound or constructed to oppose compression along the axis of wind.

A compression tee is a special fitting. It is designed for tapping into existing metal and PVC pipes. Compression couplings are also used for pipe repairs. A compression fitting works by using a rubber gasket. This gasket is compressed against the existing pipe when you tighten a nut on the end of the fitting. This makes a leak-free seal without the need to thread, glue, or solder the pipe connection. Use metal body compression fittings above ground level, PVC may be used below ground but must be installed below the frost level. Compression fittings may leak if used on heavily corroded, rusty, or pitted pipe. Drip irrigation fittings are also called compression tees.

Compression Testers are of two types, they are tapered rubber-cone type that is inserted into & held against the open sparkplug hole and the screw-in type. Compression testers are threaded into the spark plug openings. Compression testers provide rapid testing & wheel action precise control.