Maya Ellison
Connecting 1/4 plastic compression fittings can be a tricky task. It is important to note that plastic compression fittings are designed for use with plastic tubing, such as poly tubing or PVC pipe. When working with plastic tubing, it is recommended to use a plastic compression ring instead of a metal one as it requires less force, reducing the risk of damaging the pipe. Various products are available on the market, such as the SharkBite 1/4-inch OD Push-to-Connect Compression Female Adapter, which offers a quick and easy way to join multiple materials without the need for additional tools, solder, unions, or glue. However, some individuals prefer to use adapters or fittings made with PEX barbs for added peace of mind. Others opt for brass compression connections, but it is important to be cautious as over-tightening can lead to leaks.
| Characteristics | Values |
|---|---|
| Plastic compression use case | Plastic compression is used for PVC pipe/Poly tubing. It is also used for plastic refrigerator hoses. |
| Metal compression use case | Metal compression fittings are used for metal pipes. |
| Plastic compression advantages | Plastic compression rings do not require as much force as metal ones, reducing the risk of damaging the parent pipe. |
| Plastic compression fittings | Plastic compression fittings include plastic tube sleeves, plastic fittings, and plastic inserts. |
| Metal compression fittings | Metal compression fittings include compression nuts, brass compression rings, and stiffener inserts. |
| Additional tools required | Plastic compression fittings do not require additional tools, solder, unions, or glue. |
| Leak prevention | To prevent leaks, hand-tighten the fitting and then use a wrench for a quarter to half turn, checking for leaks afterward. |
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What You'll Learn
Using a plastic compression ring
If you are using a plastic compression ring with copper tubing, you can follow these steps:
- Purchase the necessary materials, such as copper tubing and a compression fitting, from a hardware store like Home Depot.
- Ensure that you have the correct size of tubing and fittings. In this case, you would need 1/4" OD copper tubing and a corresponding compression fitting.
- Consider using a stiffener insert if you are working with soft plastic pipes. This is not necessary for copper tubing.
- Assemble the compression fitting by following the manufacturer's instructions. This may involve hand-tightening the fitting and then using a wrench to turn it an additional 1/4 to 1/2 turn.
- Check for leaks after tightening the fitting.
Alternatively, you can use a product like SharkBite 1/4-in OD Push-to-Connect x 1/4-in Compression Female Adapter, which is a quick-connect fitting that does not require additional tools, solder, unions, or glue.
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Connecting plastic tubing to a valve
When connecting plastic tubing to a valve, you will need to use a compression fitting. The trick to compression fittings is that you must know the outside diameter (O.D.) of your tubing. These fittings work with couplers of various sizes. For instance, a 0.700 or 0.710 O.D. tubing will fit a 3/4-inch coupler, while a 0.670 O.D. tubing will fit a 1/4-inch coupler.
To connect the plastic tubing to the valve, first, prime the outside of the adapter, the outside of the pipe, and the inside of both ends of the coupler. You could do the connection to the pipe separately, but because it is a quick process, there is no real need to. Next, apply cement to the fitting, the PVC pipe, and the inside of both ends of the coupler. Put the coupler on the pipe first, then add a quarter turn for a good seal.
Compression fittings need to be tightened so that the ferrule squeezes down onto the tubing. It is important to note that the ferrule is inside the bolt and does not come out. If you can wiggle it loose without much effort, it is likely that the fitting is not meant for a metal-on-plastic connection. Plastic ferrules also work well and are more suitable for this purpose.
An alternative method for connecting plastic tubing to a valve is to use an adapter. Boil some water and submerge the end of the tubing until it becomes very pliable. Wear gloves, as it will be very hot, and then force the tubing onto the PVC pipe. If you can rapidly cool it with ice water, do so. If not, allow it to cool. As it cools, it will shrink and fit itself to the PVC. If you are nervous about this method, you can use a plastic or stainless hose clamp for added security.
Another alternative is to use a quick-connect fitting, such as the SharkBite 1/4-in OD Push-to-Connect x 1/4-in Compression Female Adapter. This type of fitting is a fast way to join multiple materials without the need for additional tools, solder, unions, or glue.
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Using a stiffener insert
When connecting 1/4" plastic compression pipes, it is important to use a stiffener insert if you are dealing with soft plastic pipes. This is because the insert provides stability to the tube, leading to a long-lasting watertight seal and pullout strength. It also prevents the plastic from creeping away from the joint over time, which can cause leaks or blow-offs.
There are two main types of stiffener inserts: plastic and stainless steel. Plastic insert stiffeners can be molded to size, but they may cause more flow restriction due to their thicker wall construction. On the other hand, stainless steel insert stiffeners come in either a drawn or interlock design. The drawn design, also known as tubular, solid, or full, has a tapered barrel, while the interlock design, also called a wrap or puzzle, is flared and usually has a bevel and/or dimple.
When choosing the correct insert stiffener, consider the pipe type (polyethylene, polybutylene, or PEX piping), pipe size, and whether you need an inside diameter (ID) or outside diameter (OD) controlled pipe. It is recommended to select an insert stiffener that is long enough to support where the fitting contacts the pipe.
To install the stiffener insert, simply push the PEX pipe into the fitting, and the insert will slide into the PEX pipe. Make sure to mark the proper insert depth to ensure the pipe is against the stop in the fitting. It is critical to use a stiffener when installing PEX pipe to eliminate any out-of-roundness and ensure a watertight seal.
Removing the stiffener when making push-fit connections to copper or CPVC piping can be done with needle-nose pliers and a disconnect tool. Clamp onto the insert with the pliers and push on the collar of the fitting with the tool to expand the gripper ring. Then, slowly and gently pull the insert out, ensuring it is past the stainless-steel gripper ring.
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Using a compression fitting
Compression fittings are used to connect pipes and tubes in plumbing projects, gas installations, and hydraulic equipment. They are typically made from brass, copper, or stainless steel and are used to join PVC, nylon, plastic, or copper tubing. These fittings are user-friendly, straightforward to apply and remove, and do not require soldering or heat application. They are ideal for use in confined spaces where soldering may pose a fire risk.
To use a compression fitting, you will need the fitting itself, which consists of three parts: a valve, a sleeve, and a retainer nut. You will also need some tools, such as two open-end wrenches or two adjustable wrenches, and optionally, some pipe dope to lubricate and seal the connections.
The first step is to place a pipe insert into the end of the pipe you want to join. Pipe inserts, typically made from plastic or steel, reinforce pipes and ensure they maintain a fully circular shape, making the connection easier. Next, tighten the retainer nut. To ensure the fitting is properly seated, tighten it slightly, then hit the back of the fitting. Once it is properly seated, you can continue tightening until you hear a squeaking noise caused by rotational friction.
If your compression fitting is leaking, try tightening the fitting using a pair of adjustable pipe tools in the opposite direction to the tightening motion. If the leak persists, disassemble the fitting, apply sealant to the olive, or remove and replace the olive.
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Using a brass compression ring
When connecting 1/4 plastic compression tubing, it is important to use the correct materials and techniques to ensure a secure and leak-proof connection. One way to achieve this is by using a brass compression ring, also known as a ferrule, in conjunction with a compression nut and tubing.
First, it is important to gather the appropriate materials. You will need a 1/4 inch compression nut, a brass compression ring, and plastic tubing with a compatible outside diameter (OD) of 1/4 inches. The tubing should be made of soft plastic or PEX, and it should be compatible with the compression fittings. You may also want to use thread sealant, as recommended by some sources.
Next, prepare the tubing by sliding the compression nut onto the tubing. The correct orientation of the compression nut is important: the narrower end of the nut should be facing the end of the tubing. Then, slide the brass compression ring onto the tubing. The ring should have a tapered or slightly flanged end, which should be oriented towards the end of the tubing. This ring helps to maintain the shape of the tubing within the fitting and prevent leaks by providing extra support and creating a tighter seal.
Now, insert the tubing into the corresponding coupling or valve. Hand-tighten the connection, and then use a wrench to turn it an additional quarter to half turn. This ensures a tight fit and helps to prevent leaks. It is important to note that you should not overtighten the connection, as this can damage the tubing or the fitting.
Finally, check for leaks by opening the valve or turning on the water supply. If you notice any leaks, ensure that all components are properly tightened and installed. If leaks persist, you may need to disassemble the connection and start over, checking for any damage to the tubing or fittings.
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Frequently asked questions
If you are connecting a plastic refrigerator hose, you will need more than just a compression fitting. Try using a plastic compression ring instead of a metal one, as you won't need to compress with as much force. You can also use a braided stainless ice-maker hose as an alternative.
SharkBite quick-connect fittings are the fastest way to join multiple materials without the need for additional tools, solder, unions, or glue.
Deforming the pipe a bit is expected with compression fittings. Get to the 'tight' point and tighten it from there. Once you get a leak-free joint, it is highly unlikely to start leaking again.
If you are using PEX, you can use an adapter between the compression fitting and the PEX.
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