A compression fitting is a fitting found in plumbing related and electric conduit systems to join two pipes or thin-walled pipes together. In instances where two pipes made of different components should be joined (most frequently PVC and copper), the fixtures will likely be made of one or more compatible components right for the connection. Compression fittings for attaching tubes (piping) generally have ferrules (or olives within the UK) in them. Installation Parts Supply.com is unique in that we carry everything needed to install Direct Draw and Draft including plastic tubing compression fittings

Compression fixtures are utilized thoroughly in hydraulic, gasoline, and water systems to enable the connection of tubes to threaded components like valves and tools.[1] Compression fittings are fitted to a variety of programs, like plumbing techniques in restricted areas in which copper pipe would be hard to solder without having making a flame risk, and extensively in hydraulic industrial programs. A major advantage is that the fixtures allow easy disconnection and reconnection.

In small sizes, the compression fitting is made up of an external compression nut as well as an inner compression diamond ring or ferrule (sometimes referred to as an “olive”) which is usually made from brass or copper or metal. Ferrules vary fit and material but are most frequently inside the form of a diamond ring with beveled sides. To function correctly, the ferrule should be focused properly, when it comes to copper olives they may be normally barrel formed which indicates they can not be fitted incorrectly, but where this is simply not so particularly in Hydraulic and stress applications the ferrule is fitted such that the longest sloping face in the ferrule faces from the nut.

Once the nut is tightened, the ferrule is compressed in between the nut as well as the receiving fitting; causing each ends of barrel formed copper olives to get clamped around the pipe when the midst of the ferrule bows away from the pipe, in the case of hydraulic style ferrules they now have one finish which can be larger with a 45 degree chamfer which tapers out (from installation contact with all the nut) as well as the little end typically has two internal biting sides, for applications challenging greater stress, that permeate the outside diameter from the tube, the fittings must be tightened to guidelines according to DIN2353 as to not surpass the stretchy limit from the metal ferrules, The effect is the fact that ferrule closes the area between the pipe, nut, and getting fitting, thereby developing a good joint. The clamping assistance in the pipe by the pressure in the taper at each finishes aid the prevention of movement in the pipe inside the fitted, but it is just the taper at the getting fitting alone that needs to seal completely, since if it does seal off (to both the pipe and the compression fitted) then no fluid can reach the nut threads or even the taper in the nut finish to lead to any leakages. As a result some similar fittings can be created employing an olive with only one taper (or even a repaired cone closed towards the pipe) where the sealing in that taper stops liquid from reaching the nut.

Larger sizes of compression fitted do not have just one nut to compress the ferrule but a flange using a ring of bolts that executes this. The bolts have to be tightened evenly.

Thread sealants including joints compound (pipe dope or line seal tape like PTFE tape) are unnecessary on compression fitting threads, because it is not the thread that closes the joint but rather the compression in the ferrule in between the nut and pipe. However, a tiny amount of plumber’s oil or lighting oil placed on the threads will provide lubrication to aid ensure an effortless, consistent tightening in the compression nut.

It is crucial in order to avoid more than-tightening up the nut otherwise the reliability of the compression fitting will likely be compromised from the extreme force. When the nut is overtightened the ferrule will deform incorrectly resulting in the joint to fall short. Certainly, overtightening is the most common reason for leakages in compression fixtures. An excellent guideline is always to tighten the nut initially by hand until it is too difficult to continue then tighten up the nut one fifty percent-transform more with all the aid of a wrench; the specific amount varies with the size of the fitting, as being a larger one requires much less tightening. The fitted will then be analyzed: if slight weeping is observed, the fitting is gradually tightened up until the weeping stops.

The reliability in the compression fitting depends on the ferrule, which is effortlessly vulnerable to harm. Therefore treatment needs to be delivered to when handling and tightening the fitting, although when the ferrule is damaged it really is effortlessly replaced.

Varieties of fittings

There are 2 varieties of compression fitted, regular (British kind-A/non-manipulative) and flare fixtures (British type-B/manipulative). Standard fittings need no alterations to the tubing. Flare fixtures require modification in the tubing having a special tool. Regular fixtures are generally employed for water, hydraulic and compressed atmosphere contacts, whereas flare fittings can be used for gasoline and pressure outlines.

A regular fitted may be installed using an regular wrench to tighten up the nearby nut. To eliminate it, a specific puller is often utilized to slip the nut and ferrule off of the tube. If the ferrule is difficult to get rid of it could be vulnerable with a reduce, treatment becoming delivered to not nick the pipe while cutting.


Compression fixtures are well-known as they do not require soldering, therefore they are relatively simple and fast to utilize. They require no special resources or skills to function. They just work at higher demands along with harmful gases. Compression fittings are especially valuable in installations that may need occasional disassembly or partial removal for maintenance etc., because these joint parts can be broken and remade without impacting the integrity in the joints.[contradictory] They are also used in situations in which a heat source, in particular a soldering torch, is forbidden, or in which it is sometimes complicated to get rid of continues to be of water from inside the pipe which avoid the pipe warming up to permit soldering.


Compression fittings usually are not as sturdy as soldered fixtures. They may be typically used in applications in which the fitted will never be disturbed rather than subjected to flexing or twisting. A soldered joints is extremely tolerant of flexing and bending (like when pipes knock or shake from sudden stress changes). Compression fittings are much much more sensitive to these kind of dynamic stresses. Also, they are bulkier, and might be looked at less attractive when compared to a nicely soldered joints. Compression fixtures work dwgtgh when tightened once and not disrupted.[contradictory] Some compression connections might do not be reused, like a ferrule ring kind. It can do not be used again once they have been compressed. This connector is immediately positioned on the pipe and the nut is tightened compressing the ferrule between the pipe and the entire body of the fitting. Compression of the ferrule also leads to deformation in the copper tubes. In case a compression kind connection must be redone, more often than not the compressed copper/ferrule would need to be cut off as well as a new ferrule is going to be used on a clean low-compressed bit of pipe end. This really is to assure a drip evidence sound connection.

Compression Fittings For Plastic Tubing – Superior Catering Wholesale Distributor..

We are using cookies on our website

Please confirm, if you accept our tracking cookies. You can also decline the tracking, so you can continue to visit our website without any data sent to third party services.