Understanding the Difference Between Copper and CPVC Pipe Fittings

Types of butt welding fittings

buttweld fitting is a pipe fitting formed by welding two pieces of pipe together. Buttweld fittings are generally described as having a female or male end, but in reality, both ends are welded to the pipes. The female end consists of an opening in the pipe designed to accept a male end. The male end has threads and is designed to be inserted into the female opening.

Buttweld fittings are available in many types and sizes. They are used for joining pipes in many different applications such as water supply, gas supply, drainage and waste system etc. 

They can be made of steel, stainless steel or aluminum alloy depending on their application and the environment they will be used. Buttweld fittings are available with different types of connections, such as threaded or flanged connections, depending on their application and the environment they will be used in. 

For example, underground buttweld fittings should have flanged connections with gaskets for sealing purposes. In contrast, buttweld fittings for above-ground applications can have threaded connections without gaskets due to their easier accessibility for maintenance purposes if needed. 

Copper pipe fittings and CPVC pipe fittings can feel the same in your hand. Both copper pipes and CPVC pipes are made from various materials, including chlorinated polyvinyl chloride (CPVC), which is commonly known as plastic pipe. 

Copper Pipe Fittings
Copper Pipe Fittings

The main difference between copper pipe fittings and CPVC pipe fittings is how they are joined together – buttweld vs compression fitting. These two types of plumbing connections are functionally similar but have distinct differences that set them apart for various uses. 

Knowing the differences between a buttweld and a compression fitting will help you decide which type of connection to use in your home or business.

What Is Buttweld Fitting?

Buttweld Fitting
Buttweld Fitting

A butt weld fitting is commonly used to join copper pipes to one another. The fittings are joined by welding, which creates a joint that is both leak-proof and durable. CPVC pipe fittings are joined by crimping, which is a method that can result in greater flexibility and a smoother feel when in use.

Crimping is also the method used to join CPVC to CPVC and CPVC to copper. Buttweld fittings are made from pressure-tempered copper, which is an economical method of manufacturing fittings that have been in use for more than 100 years.

The process for manufacturing copper fittings involves heating copper to a liquid state, cooling it back to a solid state, and hammering it into a shape to produce a durable, leak-proof joint.

Buttweld Carbon Steel and Stainless Steel Pipe Fittings

Buttweld fittings are also available for steel pipe. They come in standard and metric sizes. Buttweld fittings for steel pipe are made from carbon steel, stainless steel, or a combination of the two. They may be used in applications that range from residential to industrial.

Buttweld Fittings for Aluminum, Copper and Plastic Pipe

Buttweld fittings are also available for plastic, copper and aluminum pipe. They come in standard and metric sizes. Buttweld fittings for plastic pipe are made from PVC, CPVC, ABS or chlorinated polyvinyl chloride (CPVC). They may be used in applications that range from residential to industrial.

The main advantage of using buttweld fittings is durability. Because they are made from stronger materials, they will last longer than standard welding fittings.

They are also easier to install than standard welding fittings. When installing buttweld fittings for plastic pipes, you will not need special tools. You only need a wrench or a socket to tighten the fittings.

Types of Butt Welding Fittings

Buttweld fittings are available in a wide range of styles and sizes. They may be used to make 90-degree or 45-degree bends in the tubing or pipe, or they can be used to attach the tubing or pipe directly to a fitting. Some fittings may also be used as reducers (to reduce the size of tubing) or tees (to create a T-shaped section of tubing).

Types of butt welding fittings
Types of butt welding fittings

Compression Fitting (Copper)

Copper compression fittings can join copper pipes together, whether they are in a building or outdoors. You can also use a copper compression fitting to join copper pipes to one another that are in a building. The copper compression fitting is made from copper, which is what allows it to join copper pipes together.

The copper fitting is not made from plastic, so there is no risk of it corroding or breaking over time, like the CPVC compression fitting. Copper compression fittings are used for both indoor and outdoor applications.  

Copper fittings are more durable than plastic fittings and are more resistant to corrosion, so they are often used outdoors whereas plastic fittings often are used indoors.

Copper compression fittings are used for a variety of applications, including plumbing, water, sewage, gas, fuel, and electrical systems.

Types of Compression Fittings

There are three types of compression fittings, each with its uses and applications. Ball Coupler – The ball coupler is used for joining two piping systems that are at least 90° apart. This type of fitting is often used when piping systems come together at a 90° angle. unions – These fittings have a female side and a male side, which means that they can join two piping systems together.

What is a CPVC Pipe Fitting?

CPVC pipe fittings join CPVC to CPVC, which is a method that can result in greater flexibility and a smoother feel when in use. Unlike the buttweld pipe fitting, which is made from copper, the CPVC fitting is made from plastic.

CPVC fittings are commonly used in homes, restaurants, and other commercial settings where the fittings will be exposed to the elements and potentially exposed to a small number of corrosive chemicals.

CPVC fittings can be used indoors and outdoors, in both residential and commercial applications. CPVC pipe fittings are made from plastic and are not made from copper, so there is no risk of them corroding over time. They are also less likely to get damaged by physical damage than copper fittings are.

Understanding the Benefits of CPVC Pipe Joints

CPVC pipe fittings offer several benefits, including;

  1. Greater flexibility: A CPVC pipe joint is more flexible than a copper pipe joint, which is another advantage of using this type of fitting.  You can use it to make bends in the pipe and create larger curves in the pipe to take advantage of the flexibility of the joint.
  2. Less likely to corrode: Unlike copper pipe joints, CPVC pipe joints are not likely to corrode over time, which is another benefit of using them.
  3. Less likely to crack: The plastic of the fitting protects the pipe from physical damage, which reduces the chance of the pipe fitting cracking from physical damage.

How to Use a Compression Fitting

When using a compression fitting, you first need to determine the diameter of the supply pipe that you are joining to the receiving pipe. Then, you will use the appropriate tool to connect the two pipes.

If the receiving pipe is made of CPVC, you will first have to remove the cap on the end of the supply pipe to expose the female end of the fitting. Then, you will thread the female end of the fitting into the open end of the supply pipe.

If the receiving pipe is made of copper, you will first have to remove the cap on the end of the supply pipe to expose the female end of the fitting. Then, you will thread the female end of the fitting into the open end of the copper pipe.

What is the Pipe Spool?

Copper pipe is sold in coils called spools, which are made of steel. The spool is a hollow tube made of steel, and it comes in various sizes. It has an outer diameter that ranges from 2 inches to 72 inches, and it can be as long as 330 feet.

A pipe spool has a solid metal core that runs through the center of the tube. This core helps to hold the copper pipe together when it is installed. The copper pipe is wrapped around this core so that the pipe does not unravel when it is used for plumbing or other applications.

Copper pipe can be purchased in coils or cut into lengths with a saw and then connected using fittings.

Pipe Spool
Pipe Spool

Fittings (Copper)

Copper fittings are used to connect different kinds of pipes. There are a variety of different types of copper fittings available including tees, elbows, crosses, caps, reducers, unions and more. All copper fittings are made from copper because that allows them to easily connect without corrosion occurring over time.

Copper fittings can make plumbing easier by allowing you to easily change the direction a water source flows through your home or business without having to move pipes around or redo your entire system because you found out you needed something different after you had already completed your project.

Copper fittings make repairs easier by making it easy for you to replace broken sections of piping quickly and easily without having to completely remove all of your piping first so you can get to the broken section.

Pipe Wrench (Copper)

A pipe wrench is a tool that is used for tightening or loosening pipes and fittings. A pipe wrench can be used to tighten fittings so they are secure, but not over tightened, or to remove fittings when replacing them. Pipe wrenches are made from metal because metal does not corrode and will not rust over time as wood or plastic would. They also do not conduct electricity so you do not have to worry about being shocked if you use one in a wet environment.


A butt weld fitting joins copper pipes together, and a compression fitting joins two pipes made from CPVC. Both fittings are designed to join piping systems together, but the butt weld fitting is made from copper, while the other is made from plastic.

Copper is a metal that is traditionally used for piping and comes in various alloys, such as copper having very low corrosion resistance, copper having a very high resistance, and copper with both high and low resistance.

CPVC is also a type of plastic that is used for piping, and it has replaced many types of plumbing that used to be made from copper. The piping is less likely to corrode and is also less likely to crack with time than copper piping.

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