Can I Connect PVC with Metal Threads?

If you’re asking yourself can I connect PVC with metal threads, the answer is yes. But here are some details to take into consideration depending on your project, whether it's plumbing, irrigation or HVAC. PVC pipes can be connected to metal threads using appropriate PVC fittings or by depending on the kind of material or liquids that will be passed through the PVC pipes or metal pipes. Various fittings are on hand to enable connections between PVC and metal pipes and/or components. Take adapters, for instance, which support female PVC threads on one end and male metal threads on the other, making such connections possible. Ensure that the fittings used are compatible with both PVC and metal pipes for your application, and ensure a secure leak-proof connection. In this post we will go through some important details to avoid leaks or buying the wrong fittings for your DIY projects.

PVC Fittings Compatible with PVC and Metal Threads

Some PVC fittings are specifically designed to be compatible with both PVC or CPVC and metal pipes. These fittings typically have one end with PVC threads and the other end with metal threads, allowing for a seamless transition between the two types of pipes. So our best recommendation would be to use elbows, tees or coupling with a female connection when it comes to PVC or CPVC piping. And to facilitate a female connection at the point where plastic and metal pipes intersect from a male threaded pipe, a galvanized coupling is the best option.

Here are some example of fittings for PVC and metal threads:

PVC to Metal Adapters

These fittings have female PVC threads on one end and male metal threads on the other end, allowing for the connection of PVC pipes to metal pipes or components.

PVC to Metal Couplings

Couplings with PVC threads on one end and metal threads on the other end like nipples are used to join PVC pipes to metal pipes or other components you can see in our DIYer app for PVC projects.

PVC to Metal Bushings

Bushings with PVC threads on the larger end and metal threads on the smaller end are used to adapt between different pipe sizes or types, allowing for the connection of PVC pipes to metal pipes.

Caps & plugs

And finally, caps and plugs: While the cap seals the open end, the plugs are used on threaded fittings or pipe ends.

Try Our PVC Pipe
Design Software!

We showed you some fittings you can work with, but there is versatility and flexibility in plumbing or piping systems where PVC and metal pipes can be connected. Make sure that when you visit a hardware shop double check with clerks that you’re selecting the right fitting, compatible with the specific sizes and types of pipes being used in your project and to ensure a secure and leak-proof connection. 

Another approach is to use rubber with clamps on galvanized metal, you can tighten them with a socket wrench or screwdriver. You must also use silicon sealant on the galvanized metal before installing the connector. No need to add any type of glue on the PVC end. Glue and PVC cement will not work, so avoid using these on this type of connection.

PVC Projects with Metal Threads

There are some DIY projects that will definitely need a transition from PVC piping or CPVC piping to metal. This will not only be convenient since PVC pipes will resist better than copper or galvanized pipes, but will also be cheaper. These are commonly used in various plumbing and piping applications. If you are dealing with these scenarios, you must consider these components.

Home Plumbing

In residential plumbing systems, PVC pipes are often used for drainage or venting, while metal pipes such as copper or galvanized steel may be used for water supply lines. Transition fittings allow for connections between these different types of pipes. PVC pipes are smoother so you can rely on them to avoid clogs.

Industrial Piping

In industrial settings, PVC pipes may be used for chemical processing or wastewater treatment systems, while metal pipes such as stainless steel or carbon steel may be used for high-pressure or high-temperature applications. Transition fittings enable connections between PVC and metal pipes in these environments. Remember that if you decide to use PVC pipe, some fittings can break over pressure.

HVAC Systems

Heating, ventilation, and air conditioning (HVAC) systems may utilize both PVC and metal piping components. PVC pipes are commonly used for drainage or venting, while metal pipes may be used for ductwork or supply lines. Transition fittings facilitate connections between PVC and metal pipes in HVAC systems.

Outdoor Irrigation

In outdoor irrigation systems, PVC pipes are often used for water distribution, while metal pipes such as galvanized steel may be used for risers or connection points. Transition fittings allow for connections between PVC and metal pipes in irrigation systems.

Overall, transition fittings provide versatility and flexibility in system design and installation for plumbing or piping systems. Using PVC and metal threads together allows for easy adaptation and modification of existing structures without the need for extensive rework or replacement.

Try Our PVC Pipe
Design Software!

Not a Plumber? No Problem

It can be overwhelming to look at all the PVC parts and not know which ones you need. To get started, you can start from one of our pre-designed PVC DIY projects. 

As you become more familiar with the parts, you'll quickly grasp how to work with PVC materials and get inspired from our PVC pipe projects free plans.

PVC Pro or Your First Time...

Everyone is welcome to start designing their PVC project ideas in Crafti for free and bring them to life! If you've seen a cool design on TikTok or YouTube that you want to try, don't hesitate!

We have a wide range of pre-designed PVC pipe projects, from a PVC dog wheelchair to a hydroponic setup. Whether you're a beginner or experienced builder, there's something for everyone.

The Best Way to Ensure No Leaks On PVC Connections with Metal

For PVC and metal threads connections, it's recommended to use a thread sealant or thread tape specifically designed for use with both PVC and metal pipes. Here are two common types:

Thread sealants are liquid compounds that are applied to the threads of pipes and fittings before assembly. These sealants fill the gaps between the threads, creating a tight seal and preventing leaks. Examples of thread sealants suitable for PVC and metal threads connections include anaerobic sealants and pipe joint compounds.

Thread tape, also known as Teflon tape, is a thin, flexible tape made of polytetrafluoroethylene (PTFE) that is wrapped around the threads of pipes and fittings before assembly. The tape fills the gaps between the threads and provides lubrication during assembly, resulting in a tight seal. Thread tape is available in different thicknesses and densities for various applications.

Gluing PVC Pipe Steps

If you decide to glue your PVC pipes, there are some simple steps to follow. First of all you need to be in an open space, since the PVC cement has a very strong smell. Also make sure to use your mask and gloves.

First you need to have all your PVC pipes clean, make sure it doesn’t have dust or water. Also, you must have sanded the rough surfaces before, so it makes it easy to affix other parts to it.

Select a PVC cement or solvent specifically designed for PVC pipe applications. These glues normally come in a can with an applicator brush attached to the lid.

With the applicator brush add the glue to the outside of the pipe end and the inside of the fitting socket. Make sure the coat of the surface is evenly. This glue dries fast so make sure to have all the parts nearby.