Differences Between PEX Pipe Sizes & Their Uses

PEX (Polyethylene Terephthalate) pipes are widely used in plumbing systems because they are flexible, durable, and resistant to chemicals. They are also very affordable. There are several types of PEX pipe, each suited for specific applications.

Choosing the correct size of PEX pipe is crucial. If you don’t choose correctly, you may waste time and money. Fortunately, a Chula Vista repiping plumber can help you find the right PEX pipe for your hose.

Each size has its advantages and disadvantages, and we are ready to describe them. This article will explain the differences between PEX pipe sizes and their uses.

Differences Between PEX Pipe Sizes & Their Uses

Why Should I Use PEX pipes?

Copper pipe was the best alternative for water supply lines for many decades. Copper didn’t contaminate water as old lead pipes, and it resisted corrosion quite well. Copper is still used to this day, but PEX or cross-linked polyethylene has become the best pipe option because it’s flexible and affordable.

Besides, PEX reduces the risk of leaks while eliminating splicing. It’s a practical option for any homeowner looking for resistant and long-lasting pipes.

Types Of Pex Pipes

Pex is still poorly understood by the average person, despite having many advantages and popularity. Not anyone can indeed install PEX; it requires special tools to crimp, cut, and clamp this material. However, even without installing it, you should know the different types of PEX. 

PEX comes in over 20 varieties, each with different pros and cons. Before installing your PEX pipes, you must carefully consider what you need for your project. You should always consult with a Fountain Valley repiping plumber to obtain the best results while getting a basic understanding of the four main PEX types. 

The four types are:

  • PEX-A: The most durable, flexible, and strongest option. It’s an excellent alternative for a section of tubing were to become deformed, you would have no choice but to replace it. 
  • PEX-B: While PEX-A has a higher price, PEX-B is cheaper. You can save money with PEX-B if your project involves long, straight runs. Nevertheless, notice that PEX-B breaks where PEX-A would bend. 
  • PEX-C: PEX-B and PEX-C are very similar. However, PEX-C is the softer of the two, so it is more vulnerable to kinks. 
  • PEX-AL-PEX: It is the most expensive option because it has an aluminum layer that helps the tubing keep its shape if bent. PEX-AL-PEX is excellent for heating systems whose components corrode when exposed to certain elements, such as oxygen.

What To Consider When Calculating PEX Pipe Size


You must consider the “nominal” size when buying PEX. This number indicates if the pipe is compatible with fittings of the same size. 

The flexible tubing varies from 50 feet to 1,000 feet. As for the diameter, PEX tubes range from 3/9-inch to 1-inch (only for residential applications).

Your Lakewood repiping plumber will probably recommend installing ½-inch or ¾-inch PEX for main lines, especially if you want to keep adequate water flow. 

Water Pressure

PEX lines can reduce wastewater, but not all fixtures benefit from all PEX lines. You probably don’t want to spend more than 10 minutes waiting for your bathtub to be full. Therefore, opt for running a minimum ½-inch line to the tub. Washing machines and dishwashers can also benefit from ½-inch lines.

⅜-inch lines work for sinks, showers, and commode tanks. 

Water-Supply Manifold Systems

Plumbers can run PEX systems from a water supply manifold to each fixture. Most whole-house residential manifolds have blue and red valves to differentiate between hot and cold water lines. The best practice is to go from a wider line to a narrower one, but not the contrary. 

Pressure Drop

The larger the distance from the manifold to the tube fixture, the wider the PEX pipe should be. You can opt for a ⅜-inch line for lengths up to 250 feet. If you want to adequate water pressure up to 350 feet, opt for a ½-inch line. A 500-foot line will work better with a ¾-inch PEX tubing system. 

Consult With A Top-Rated California Repiping Plumber

Regardless of your option, you should never opt for the first option you see at the store and then DIY the installation. It’s always better to consult with a professional. 

At Integrity Repipe, we can help you find the correct PEX pipe size to get the best water flow in your house. We guarantee safe and expert work so that you don’t end up with leaks over time. Contact us to schedule an appointment project! 

Published by – Integrity Repipe Inc

Integrity Repipe Inc – Mission Viejo, CA
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Integrity Repipe Inc – Chula Vista, CA
591 Telegraph Canyon Road
Chula Vista, CA 91910
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Integrity Repipe Inc – Ladera Ranch, CA
27762 Antonio Parkway L1
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Integrity Repipe Inc – Lakeside, CA
8337 Winter Gardens Boulevard
Lakeside, CA 92040
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Integrity Repipe Inc – Aliso Viejo, CA
27068 La Paz Rd #771
Aliso Viejo, CA 92656
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Integrity Repipe Inc – Oceanside, CA
1759 Oceanside Blvd C,
Oceanside, CA 92054
Phone: 442-300-3057
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Integrity Repipe Inc – Porter Ranch, CA
19360 Rinaldi
Porter Ranch, CA 91326
Phone: 818-630-9265
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