The Difference Between Equal Tee and Reducing Tee in Pipe Fittings

In plumbing, industrial piping, and gas distribution systems, a "Tee" is one of the most common pipe fittings used to combine or divide fluid flow. However, choosing the right type is critical for maintaining proper flow pressure. The two primary types are the Equal Tee (Straight Tee) and the Reducing Tee (Unequal Tee).

So, what is the exact difference between them? Let’s break it down.

Tee is also called pipe fitting tee or tee fitting or tee joint. The pipe fitting tee can change the fluid direction and branch out of the main pipeline. Usually, we can classify all tees according to the pipe diameter. The primary raw material includes malleable iron tee, ductile iron tee, carbon steel tee, cast steel tee, alloy steel tee, stainless steel tee, copper tee, aluminium alloy tee, plastic tee, argon tee, asphalt tee, PVC tee and other materials.

Quick Comparison: Equal Tee vs. Reducing Tee

diagram showing difference between equal tee and reducing tee

What is an Equal Tee (Straight Tee)?

An Equal Tee, also known as a straight tee, has three branch openings of the exact same diameter.

Design: If the main pipe is 2 inches, the branch connecting at a 90-degree angle will also be 2 inches.

Looking for high-quality malleable iron equal tees?

We manufacture precision-threaded standard equal tees for bulk wholesale.

View Our Equal Tee Catalog

Equal Tee Classification and Applicable Scenarios

Welded Equal Tee: Connected by welding, suitable for applications requiring a stable connection and high strength, such as high-pressure and high-temperature environments.

Flanged Equal Tee: With a flanged connection, it is suitable for applications where frequent disassembly is required, providing more flexible installation and maintenance options.

Threaded Equal Tee: Easy to install with a threaded connection, suitable for small to medium-sized piping systems, no welding required.

As shown in the figure below:

Galvanized Equal Tee	Black Equal Tee

Equal Tee DIMENSIONS

Application of TEE

Construction and maintenance of projects in the petrochemical industry, petroleum and natural gas, liquefied gas, chemical fertilizer, power plant, nuclear power, shipbuilding, papermaking, pharmacy, food hygiene, urban construction, and other industries of these projects have pipeline demands about the reducing tees and equal tee.

It is the application of TEE in the gas pipeline.

As a partner of China Gas Group, Jianzhi casting group is a significant supplier of gas pipelines in China. And is a member of the China Gas Association. If you have relevant requirements for gas pipeline equal tee and reducing tee, you are welcome to inquire.

What is a Reducing Tee (Unequal Tee)?

The diameter is different from that of the other two branches. It is a reducing tee. Another reducing tee, the diameters of the three ports are different, also called reducing tee. The diameter of the branch pipe becomes smaller, which can increase the medium pressure of the branch pipe.

Design: It is usually written with the run pipe sizes first, followed by the branch size. For example, a "2 x 2 x 1 Reducing Tee" means the main flow line is 2 inches, but the 90-degree branch restricts down to 1 inch.

Need specific reducing sizes for your engineering project?
As a direct manufacturer, we offer a wide range of standard and custom reducing tees.

Explore Custom Plumbing Fittings 

Reducing Tee Classifications and Scenarios

• Welded Reducing Tee: Reducing welded Tee for applications that require a change in pipe diameter in a piping system to maintain a stable connection.

• Flange Reducing Tee: Reducing flange tee for flanged connections where different diameters of pipes need to be connected in a piping system.

• Threaded Reducing Tee: Reducing threaded tees, which are suitable for small- to medium-sized piping systems, offers the option of connecting different pipe diameters.

These classifications are selected based on specific needs and characteristics of the piping system. For example, welded types are suitable for high-pressure, high-temperature environments, while flanged connections are suitable for applications that require frequent removal and replacement. Threaded connections, on the other hand, are more suitable for small to medium-sized, low-pressure piping systems. Reducing Tee is usually used when there is a need to change the direction of fluid flow or pipe diameter in the pipeline to meet the requirements of system design and operation.

As shown in the figure below:

Reducing Tee, Type 1	Reducing Tee, Type 2

Reducing Tee DIMENSIONS

How to Choose Between Them for Your Project?

Selecting between an equal tee and a reducing tee depends entirely on your system's flow requirements and pipe dimensions:

• Do you need to maintain the same pipe diameter throughout? Choose the Equal Tee.

• Are you splitting flow to a smaller fixture or secondary line? Choose the Reducing Tee.

• Material Matters: Whether you use equal or reducing tees, ensure they are made from high-quality Malleable Iron (ASTM A197) with accurate NPT/BSPT threading to prevent leaks in gas or plumbing applications.

Are you a contractor, distributor, or project manager looking to source reliable B2B pipe fittings? At JIANZHI, we stock a massive inventory of both equal tees and reducing tees, backed by UL and FM certifications.

• 100% Pressure Tested for zero leaks.

• Competitive wholesale pricing.

• Fast global shipping.

Request a Bulk Quote Today

Related reading:

What Size Black Pipe is Used for Gas Lines?

NPT vs BSP Threads: Understanding the Difference for Australia's Galvanized Pipe Fittings Market

NPT vs BSP Threads: How to Choose the Right Thread for Galvanized Pipe Fittings in Australia | JIANZHI