What is the inside diameter of 3/4 PEX pipe?

Asked By: Franca Cimadevila | Last Updated: 14th April, 2020
Category: home and garden indoor environmental quality
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Dimensional data and specifications
PEX Tubing size (CTS/Nominal) Outside Diameter (OD) Weight lbs/100ft
1/2" 0.625" 5.80
5/8" 0.750" 8.38
3/4" 0.875" 11.00
1" 1.125" 17.06

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Thereof, how do you measure the diameter of a PEX pipe?

Take a string or piece of paper (or flexible tape measure), wrap it once around the pipe, mark it, and measure it. If it's about 1.5", you have 1/2" pipe. If it's about 2.5", you have 3/4" pipe.

Furthermore, is PEX the same size as copper? The OD of PEX is normally the same as copper, which is 1/8 more than the nominal size. For example, "1/2 inch" copper or PEX is 5/8 OD. 2. PEX needs thicker walls than copper.

Similarly, you may ask, what do the different colors of PEX pipe mean?

The Colors of PEX Tubing. It is available in red, blue, and white to make classification of water lines easier (red for hot, blue for cold, white for supply lines or single-color systems). The color of PEX does not change any of the tubing's ratings.

Can I run 3 4 PEX to shower?

The key is how much will be running at the same time. One 1/2" pex line feeding two showerheads is close to that tubing's max flow depending on the hot/cold mix. 3/4" pex is somewhat larger than 1/2" copper, and 3/4" copper is probably a good size for a bathroom group.

39 Related Question Answers Found

Why is PEX banned in California?

Church, executive director of the Plastic Pipe and Fittings Association. Uponor Wirsbo said its PEX pipe was introduced in California in 1990 and that the product helps solve problems in areas with aggressive soil conditions that copper pipe cannot solve.

What are the disadvantages of PEX?

PEX Plumbing Disadvantages
  • PEX may leach BPA and other toxic chemicals.
  • PEX is extremely sensitive to UV light.
  • PEX can be damaged by chemicals and pests.
  • PEX can't be installed in high heat areas.
  • PEX is semi-permeable, which means liquid can enter the pipe.

How do you measure pipe diameter?

Measure the Outside Diameter (OD) of your pipe or pipe fitting:
  1. Wrap a string around the pipe.
  2. Mark the point where the string touches together.
  3. Use a ruler or measuring tape to find the length between the tip of the string and the mark you made (circumference)
  4. Divide the circumference by 3.14159.

What is the flow rate of 1/2 PEX pipe?

Pressure Drop Table (psi per 100ft of tubing length)
Flow rate, GPM PEX tubing size
1/2" 1"
1.0 1.70 0.10
2.0 5.30 0.35
3.0 11.0 0.63

Does pipe size affect water pressure?


Increasing the pipe diameter won't change the static pressure (the pressure when no water is flowing). When you open a spigot, however, the water pressure at that spigot decreases somewhat, and because a larger pipe provides a lower resistance to flow, the water pressure will decrease less with the larger pipe.

How do you measure pipe size?

The equation for pipe diameter is the square root of 4 times the flow rate divided by pi times velocity. For example, given a flow rate of 1,000 inches per second and a velocity of 40 cubic inches per second, the diameter would be the square root of 1000 times 4 divided by 3.14 times 40 or 5.64 inches.

What size water line do you run from meter to house?

The most common requirement is that you use about 4' of 1" copper at the meter, then connect the 1 1/2" PVC running to the house. Then at the house you reduce back to 1" and run the final 4' into the house with copper tubing. 3.

Does PEX pipe restrict water flow?

Pex/plastic pipe have higher flow rates than copper. However pex fittings ID (inside diameter) is smaller than the pipe of the same size, so it actually does impede water flow.

Why is PEX plumbing bad?

PEX failures
Piping fails when the pipes are exposed to chlorine that is within the water, exposure to direct sunlight before its installation. Furthermore PEX pipe is vulnerable when it comes in contact with such solutions as petroleum products and oxygen. It can leach toxic chemicals from pipe material also.

What is the difference between white and blue PEX?


Red PEX pipe carries hot water. Blue PEX pipe carries cold water. White PEX pipe can be used for either hot or cold water. Gray PEX pipe, like white, can be used for either hot or cold water (although not all DIY centers carry gray).

Can you use PEX pipe for air line?

PEX is designed for liquids and shouldn't be used for air lines. The tubing is "likely" ok, but the fittings are not, AFAIK. There is a similar product out there, however, that is designed for air.

Does PEX pipe need insulation?

Pipe insulation is a prudent step to take. Not only does insulation promote energy efficiency, but it can also reduce potential problems with moisture and condensation. That's because PEX pipes—basically a type of plastic—are physically different from other common piping materials.

Which is better copper or PEX?

PEX doesn't degrade like copper, higher PSI rating freezing pipes will still burst, but PEX will be able to handle more freezing water than copper. PEX Tubing is much more resistant to freeze-breakage than copper or rigid plastic pipe. PEX is cheaper/easier to install and you generally don't need as many fittings.

Which PEX pipe is the best?


PEX-A, which has the most flexible tubing and best freeze- and kink resistance, is ideal for use with kitchen and bath fixtures. PEX-B is slightly less flexible and less freeze-resistant. Both types of tubing come in three colors—red, white, and blue—in diameters ranging from 1/4-inch to 3 inches.

What are the different types of PEX pipe?

If you've ever shopped for PEX tube you probably know there are three main types. These are PEX A, PEX B and PEX C.

Should I replace copper with PEX?

The installer recommends replacing my copper pipes with PEX. If so, you could get another 23 years out of your copper pipes and spare the cost to replace plumbing. If it's a small area that's leaking, you could just replace that section with either PEX or copper. Both types are interchangeable.