A 3/16 compression ferrule is a fitting used in plumbing and electrical conduit systems to join two pipes or thin-walled pipes together. In instances where two pipes made from dissimilar components have to be joined (most often Pvc material and copper), the fixtures will be manufactured from one or more compatible materials appropriate for the bond. Compression fixtures for attaching tubing (piping) commonly have ferrules (or olives in the UK) in them.

Compression fixtures are employed extensively in hydraulic, gas, and water techniques to allow the connection of tubing to threaded elements like valves and tools.[1] Compression fixtures are suitable for a number of programs, such as plumbing techniques in confined spaces where copper pipe will be challenging to solder without having creating a fire hazard, and extensively in hydraulic industrial applications. A significant advantage would be that the fixtures allow simple disconnection and reconnection.

In small dimensions, the compression fitting consists of an external pressure nut and an inner compression diamond ring or ferrule (sometimes referred to as an “olive”) that is usually made of brass or copper or metal. Ferrules differ in shape and material but are most frequently in the form of a ring with beveled edges. To work correctly, the ferrule must be focused correctly, in the case of copper olives these are usually barrel formed and this means they cannot be installed wrongly, but in which this may not be so specifically in Hydraulic and high pressure programs the ferrule is installed such that the longest sloping face of the ferrule encounters away from the nut.

Once the nut is tightened, the ferrule is compressed in between the nut and the getting fitted; causing each ends of barrel shaped copper olives to be clamped around the water pipe when the middle of the ferrule bows away from the water pipe, in the case of hydraulic style ferrules they now have one end which can be larger using a 45 degree chamfer which tapers out (from set up exposure to the nut) and also the little end typically has two inner biting sides, for programs demanding higher stress, that penetrate the exterior size from the pipe, the fixtures must be tightened to recommendations depending on DIN2353 as not to exceed the elastic restrict of the steel ferrules, The result is that the ferrule seals the space in between the water pipe, nut, and receiving fitted, therefore forming a good joints. The clamping assistance of the water pipe from the force on the taper at both finishes assist in preventing motion from the pipe inside the fitting, however it is only the taper in the getting fitted alone that should seal totally, because if it does seal (to both water pipe as well as the compression fitted) then no liquid can get to the nut threads or even the taper on the nut end to lead to any leaks. As a result some comparable fittings can be produced utilizing an olive with only one taper (or perhaps a repaired cone sealed for the pipe) in which the sealing in that taper prevents fluid from getting to the nut.

Larger dimensions of compression fitted do not possess just one nut to compress the ferrule but a flange with a ring of bolts that performs this. The bolts need to be tightened evenly.

Line sealants like joint substance (water pipe dope or line seal tape including PTFE tape) are unnecessary on compression fitted threads, because it is not the thread that closes the joints but alternatively the compression from the ferrule in between the nut and water pipe. However, a modest amount of plumber’s oil or light oil placed on the threads will provide lubrication to help ensure a smooth, consistent tightening in the pressure nut.

It is crucial to prevent more than-tightening the nut otherwise the reliability of the pressure fitted is going to be compromised through the excessive force. In the event the nut is overtightened the ferrule will deform incorrectly resulting in the joint to fall short. Indeed, overtightening is easily the most common cause of leakages in compression fittings. An excellent guideline would be to tighten the nut first by hand until it is actually too hard to continue then tighten the nut one fifty percent-transform more using a wrench; the specific amount varies with how big the fitting, as being a larger one demands much less tightening up. The fitting will be analyzed: if minor weeping is noticed, the fitted is steadily tightened up until the weeping prevents.

The reliability in the pressure fitted is dependent upon the ferrule, which can be effortlessly susceptible to harm. Therefore care should be delivered to when handling and tightening up the fitted, even though when the ferrule is damaged it is easily changed.

Types of fixtures

The two main types of pressure fitted, regular (British type-A/low-manipulative) and flare fittings (British kind-B/manipulative). Standard fixtures need no alterations towards the tubing. Flare fixtures need adjustment from the tubes having a unique device. Regular fixtures are typically utilized for water, hydraulic and compressed air contacts, whereas flare fittings can be used for gasoline and stress lines.

A typical fitting can be set up using an ordinary wrench to tighten the nearby nut. To remove it, a specific puller is usually utilized to slide the nut and ferrule off of the tube. In the event the ferrule is difficult to get rid of it can be vulnerable using a cut, care becoming come to not nick the pipe while reducing.


Pressure fittings are popular because they do not need soldering, so they are comparatively quick and easy to make use of. They need no unique resources or skills to use. They work at higher demands with toxic gases. Pressure fixtures are particularly valuable in installations that may require periodic disassembly or partial removal for upkeep etc., as these joint parts can be broken and remade without affecting the integrity from the joints.[contradictory] They are also used in situations where a source of heat, in particular a soldering torch, is forbidden, or in which it is sometimes complicated to get rid of remains of water from inside the water pipe which prevent the pipe heating up to allow soldering.


Compression fixtures are not as robust as soldered fixtures. These are usually used in applications where the fitting is definitely not disrupted and never exposed to flexing or twisting. A soldered joints is extremely tolerant of flexing and bending (including when pipes knock or shake from unexpected pressure changes). Pressure fittings are far more responsive to these type of frzzdy stresses. They are also bulkier, and may be considered less aesthetically pleasing than a nicely soldered joint. Compression fittings work best when tightened once rather than disturbed.[contradictory] Some pressure connectors may do not be used again, such as a ferrule diamond ring kind. It can do not be reused as soon as they have been compressed. This connector is directly placed over the pipe and also the nut is tightened compressing the ferrule between the water pipe and the entire body from the fitted. Compression with this ferrule also brings about deformation of the copper tubes. If a pressure type link has to be redone, more often than not the compressed copper/ferrule will need to be shut down as well as a new ferrule is to be applied to a clear non-compressed part of water pipe end. This is to ensure a leak proof sound connection.

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