What are polymer fittings?

Polymer fittings are plumbing fittings made of polymer materials, which are synthetic substances composed of large molecules that are formed by the chemical bonding of many repeating subunits. Polymer fittings are often used as an alternative to traditional metal fittings in plumbing systems because they offer a number of advantages, such as being lighter in weight, resistant to corrosion, and easier to install.

Polymer fittings can be made from a variety of polymers, including polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), and acrylonitrile butadiene styrene (ABS). They are commonly used in a variety of applications, such as hot and cold water distribution, irrigation systems, and gas pipelines.

Polymer fittings are available in a wide range of sizes and shapes, including elbows, tees, couplings, adapters, and valves. They are typically designed for use with specific types of pipes, so it's important to choose the right fitting for your particular application.


Polymer fittings are designed to be compatible with polymer pipes, such as PEX (cross linked polyethylene) and CPVC (chlorinated polyvinyl chloride), as well as other types of plastic pipes. They are typically joined to the pipe using compression fittings, which involve sliding a nut and a compression ring onto the pipe before inserting it into the fitting body. The nut is then tightened, compressing the ring onto the pipe and creating a watertight seal.

One of the main advantages of polymer fittings is that they are resistant to corrosion, which makes them ideal for use in areas with high levels of moisture or exposure to chemicals. They are also less likely to break or crack than metal fittings, which can be particularly important in applications where pipes are subject to freezing or impact.

Another advantage of polymer fittings is that they are lightweight and easy to handle, which can make installation faster and easier. They are also typically less expensive than metal fittings, which can be important for cost conscious plumbing projects.

However, it's important to note that polymer fittings may not be suitable for all applications. They typically have a lower maximum operating temperature than metal fittings, and may not be suitable for high pressure or high temperature applications. It's important to consult the manufacturer's specifications and guidelines when selecting polymer fittings for a particular application.


In addition to their resistance to corrosion and ease of installation, polymer fittings have a number of other advantages. For example:

  1. Flexibility: Polymer fittings are typically more flexible than metal fittings, which can be an advantage when installing pipes in tight or awkward spaces.

  2. Chemical resistance: Depending on the specific polymer material used, polymer fittings can be highly resistant to a wide range of chemicals, including acids, alkalis, and solvents.

  3. Reduced noise: Polymer fittings are often quieter than metal fittings, which can be important in applications where noise levels need to be minimized.

  4. Low thermal conductivity: Polymer fittings have a lower thermal conductivity than metal fittings, which can help to reduce heat loss and improve energy efficiency.

  5. Non toxic: Many polymer materials used in plumbing applications are non toxic and approved for use in potable water systems.

Despite these advantages, it's important to remember that polymer fittings also have some limitations. For example, they may be more susceptible to UV degradation and may not be suitable for outdoor applications unless they are specifically designed for that purpose. It's also important to follow proper installation procedures and use the correct tools and fittings to ensure a safe and reliable plumbing system.

One important consideration when using polymer fittings is their compatibility with the pipes and other components in the plumbing system. For example, some polymer fittings may be designed for use only with specific types of polymer pipes, while others may be compatible with a wider range of materials. It's important to select fittings that are designed for use with the specific type of pipe being used in the plumbing system.

Another consideration is the potential for leaks or failures in the fittings over time. While polymer fittings are generally reliable and durable, they may be more susceptible to damage from impact or exposure to certain chemicals. Regular inspection and maintenance of the plumbing system can help to identify and address any potential issues before they become more serious.

Overall, polymer fittings can be a practical and cost effective choice for many plumbing applications, particularly in situations where weight, corrosion resistance, or ease of installation are important factors. As with any plumbing component, it's important to choose the right fitting for the job and follow proper installation procedures to ensure a safe and reliable plumbing system.