Od compression fitting

Od compression fitting DEFAULT

What does OD compression mean?

The fittings we sell may have compression or National Pipe Thread tapered ends (NPT). Compression ends are made for a tube which has a specific outside diameter (OD). For example, a ¼” compression fitting is designed to connect a section of tubing which has an OD of ¼”.

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Also question is, what is better flare or compression fittings?

Flare fittings are always preferred to use with soft tubing over 3/8"od while compression fittings should be use with all hard copper and soft tubing 3/8"od and smaller sizes. Never use compression fittings on gas connections. These Flare fittings are used for joining tubing in hydraulic system.

One may also ask, are Compression Fittings reliable? Although compression fittings are generally considered more reliable than threaded fittings, there are some potential problems. In general, compression fittings are not as resistant to vibration as soldered or welded fittings. Repeated bending may cause the ferrule to lose its grip on the tube.

Keeping this in consideration, how does a ferrule fitting work?

To work properly, the ferrule must be oriented correctly—usually the ferrule is fitted such that the longest sloping face of the ferrule faces away from the nut. The result is that the ferrule seals the space between the pipe, nut, and receiving fitting, thereby forming a tight joint.

How do you stop a compression fitting from leaking?

Tighten compression fittings firmly with two wrenches to crimp the ferrule onto the pipe (Photo 3). Also make sure the pipe or tube goes straight into the fitting. Misalignment will cause a leak. If the fitting leaks after you turn on the water, try tightening the nut an additional one-quarter turn.

Sours: https://askinglot.com/what-does-od-compression-mean

Compression Fittings

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  1. 11923-ENP-PKG
    #10-32 to 1/8” Tube Connector, ENP Brass, Pack of 10
  2. 11923-PKG
    #10-32 to 1/8” Tube Connector, Pack of 10
  3. 15160-BLK
    #10-32 to 1/16" O.D. Tube Compression Fitting
  4. 15160-ENP-BLK
    #10-32 to 1/16" O.D. Tube Compression Fitting, ENP Brass
  5. 15160-ENP-PKG
    #10-32 to 1/16" O.D. Tube Compression Fitting, ENP, Pack of 10
  6. 15160-PKG
    #10-32 to 1/16" O.D. Tube Compression Fitting, Pack of 10
  7. 3810-1-PKG
    1/8" NPT to 1/8” Tube Connector, Pack of 10
  8. 3810-2-ENP-PKG
    1/16" NPT to 1/8” Tube Connector, ENP Brass, Pack of 10
  9. 3810-2-PKG
    1/16" NPT to 1/8” Tube Connector, Pack of 10
Sours: https://clippard.com/products/fitting-compression
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.450″ OD to .710″ OD Compression Fittings


The customary method in drip irrigation installation is to use the 1/2″ drip tubing as the main lateral or the supply line to deliver water to the plant area. It also can be used as the sub lateral to deliver the water directly to the plants. The most common drip fittings used in the installation of drip irrigation are the compression fittings.

Polyethylene drip tubing is available in coils of 50′, 100′, 200′, 500′ and 1000′. DIG’s premium 1/2″ drip tubing is made in a range of different lengths. It is made with 2%+ carbon black for extra resistance to ultraviolet rays and is sized .600 ID x .700 OD which is universally accepted as the standard size. The size of the drip tubing varies by manufacturer, with each size displaying different flow characteristics but serving the same purpose – as a supply line for drip irrigation. To ensure problem-free operation, we recommend using DIG’s premium 1/2″ drip tubing with the .700 OD black compression fittings. In the event that you have an odd size of drip tubing, we offer reducing couplings and universal fittings to complete the project.

The compression fittings are available in configurations that include couplings, tees, elbows, PVC pipe to drip tubing connectors, ends, swivel adapters and swivel tees to start and complete the installation of any drip irrigation layout. For any drip irrigation installation, we highly recommend installing a 25 PSI pressure regulator at the beginning of the system. The pressure regulator is used to lower the incoming pressure of the water to the system’s suggested operating pressure of 25 PSI, which is within the range of recommended pressures for drip irrigation or micro-sprinkler systems.

Compression fitting installation:

Hold the compression fitting in one hand and the drip tubing in the other and force the drip tubing into the fitting for about 1/2″ to 3/4″ by “walking” or “wiggling” the drip tubing inside the fittings.

Drip fitting details and uses

The .700 OD fittings with black inserts can be used with .690 OD, .700 OD and .704 OD drip tubing, and with our Brown PC drip line. They include:

  • Model C33 coupling: use to connect two pieces of polyethylene drip tubing
  • Model C35 tee: allows for a three-way layout of polyethylene drip tubing
  • Model C36 elbow: allows a 90° layout around corners for polyethylene drip tubing
  • Model D48 coupling: use to connect polyethylene drip tubing into 1/2″ PVC pipe
  • Model Q58 end cap: use to close the end of polyethylene drip tubing. The swivel cap can be removed when it is time to flush the line.

The .710 OD fittings with blue inserts can be used with .700 OD, .704 OD and .710 OD drip tubing. They include:

  • Model C43 coupling: use to connect two pieces of polyethylene drip tubing
  • Model C45 tee: allows for a three-way layout of polyethylene drip tubing
  • Model C46 elbow: allows a 90° layout around corners for polyethylene drip tubing
  • Model Q68 end cap: use to close the end of polyethylene drip tubing. The swivel cap can be removed when it is time to flush the line.

The reducing compression fittings with blue x black and green x black inserts can be used to connect two different sizes of drip tubing, .700 OD x .710 OD and .700 OD x .630 OD. They include:

  • Model D50G reducing coupling: connects DIG’s .700 OD polyethylene drip tubing (black insert) to RAIN DRIP’s or RAIN BIRD’s .620/.630 OD polyethylene drip tubing (green insert)
  • Model D50B reducing coupling: connects DIG’s .700 OD polyethylene drip tubing (black insert) to TORO’s .710 OD polyethylene drip tubing (blue insert)
Sours: https://www.digcorp.com/homeowner-drip-irrigation-products/450-od-to-710-od-compression-fittings/
Installation of a PEX compression-fit system - COMAP

Compression fitting

A compression fitting is a fitting used in plumbing and electrical conduit systems to join two tubes or thin-walled pipes together. In instances where two pipes made of dissimilar materials are to be joined (most commonly PVC and copper), the fittings will be made of one or more compatible materials appropriate for the connection. Compression fittings for attaching tubing (piping) commonly have ferrules (or olives in the UK) in them.

Compression fittings are used extensively in Hydraulic, Gas and for hot and cold water systems to enable the connection of tube (copper, steel Nylon etc) to threaded components eg valves and tools; compression fittings are suited to a variety of applications, commonly in water plumbing systems such as where confined spaces where copper pipe would be difficult to solder without creating a fire hazard, and extensively in hydraulic industrial applications a major benefit being that the fittings allow easy disconnection and reconnection.

How they work[edit]

In small sizes, the compression fitting is composed of an outer compression nut and an inner compression ring or ferrule (sometimes referred to as an "olive") that is typically made of brass or copper or steel. Ferrules vary in shape and material but are most commonly in the shape of a ring with beveled edges. To work properly, the ferrule must be oriented correctly, in the case of copper olives they are normally barrel shaped and this means they cannot be fitted incorrectly, but where this is not so particularly in Hydraulic and high pressure applications the ferrule is fitted such that the longest sloping face of the ferrule faces away from the nut.

When the nut is tightened, the ferrule is compressed between the nut and the receiving fitting; causing both ends of barrel shaped copper olives to be clamped around the pipe when the middle of the ferrule bows away from the pipe, in the case of hydraulic style ferrules they currently have one end which is larger with a 45 degree chamfer which tapers away (from installation contact with the nut) and the small end generally has two internal biting edges, for applications demanding much higher pressure, that penetrate the outside diameter of the tube, the fittings must be tightened to guidelines as per DIN2353 as not to exceed the elastic limit of the steel ferrules, The result is that the ferrule seals the space between the pipe, nut, and receiving fitting, thereby forming a tight joint.

Larger sizes of compression fitting do not have a single nut to compress the ferrule but a flange with a ring of bolts that performs this task. The bolts have to be tightened evenly.

Thread sealants such as joint compound (pipe dope or thread seal tape such as PTFE tape) are unnecessary on compression fitting threads, as it is not the thread that seals the joint but rather the compression of the ferrule between the nut and pipe. However, a small amount of plumber's grease or light oil applied to the threads will provide lubrication to help ensure a smooth, consistent tightening of the compression nut.

It is critical to avoid over-tightening the nut or else the integrity of the compression fitting will be compromised by the excessive force. If the nut is overtightened the ferrule will deform improperly causing the joint to fail. Indeed, overtightening is the most common cause of leaks in compression fittings. A good rule of thumb is to tighten the nut first by hand until it is too difficult to continue and then tighten the nut one half-turn more with the aid of a wrench; the actual amount varies with the size of the fitting, as a larger one requires less tightening. The fitting is then tested: if slight weeping is observed, the fitting is gradually tightened until the weeping stops.

The integrity of the compression fitting is determined by the ferrule, which is easily prone to damage. Thus care should be taken to when handling and tightening the fitting, although if the ferrule is damaged it is easily replaced.

Types of fittings[edit]

There are two 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, hydraulic 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.


Compression fittings are popular because they do not require soldering, so they are comparatively quick and easy to use. They require no special tools or skills to operate. They work at higher pressures and with toxic gases. Compression fittings are especially useful in installations that may require occasional disassembly or partial removal for maintenance etc., since these joints can be broken and remade without affecting the integrity of the joint.[contradictory] They are also used in situations where a heat source, in particular a soldering torch, is prohibited, or where it is difficult to remove remains of water from inside the pipe which prevent the pipe heating up to allow soldering.


Compression fittings are not as robust as soldered fittings. They are typically used in applications where the fitting will not be disturbed and not subjected to flexing or bending. A soldered joint is highly tolerant of flexing and bending (such as when pipes knock or shake from sudden pressure changes). Compression fittings are much more sensitive to these type of dynamic stresses. They are also bulkier, and may be considered less aesthetically pleasing than a neatly soldered joint. Compression fittings work best when tightened once and not disturbed.[contradictory] Some compression connectors may never be reused, such as a ferrule ring type. It can never be reused once they have been compressed. This connector is directly placed over the pipe and the nut is tightened compressing the ferrule between the pipe and the body of the fitting. Compression of this ferrule also results in deformation of the copper tubing. If a compression type connection needs to be redone, more often than not the compressed copper/ferrule would need to be cut off and a new ferrule is to be used on a clean non-compressed piece of pipe end. This is to assure a leak proof sound connection.

See also[edit]

Notes and references[edit]

External links[edit]

  • [http:// "Jointing Copper Tubes: Compression Joints"]. UK Copper Board.
Sours: https://en.wikipedia.org/wiki/Compression_fitting

Fitting od compression

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