Types of Fittings
There are two traditional types of compression fitting, standard (British type-A/non-manipulative) and flare fittings (British type-B/manipulative). Standard fittings require no modifications to the tubing. Flare fittings require modification of the tubing with a special tool. Standard fittings are typically used for water and compressed air connections, whereas flare fittings are used for gas and high pressure lines.
A standard fitting can be installed using an ordinary wrench to tighten the surrounding nut. To remove it, a specialized puller is often used to slide the nut and ferrule off the tube. If the ferrule is difficult to remove it can be weakened with a cut, care being taken to not nick the pipe while cutting.
A newer type is push-in compression fittings. These fit over the end of a tube using a grip ring to hold the sides of the tube and an O-ring to form a seal at the end.
Read more about this topic: Compression Fitting
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