What size is a water line fitting?

Author: Estefania Sanford  |  Last update: Monday, June 2, 2025

The water line size for a residential home is usually a ¾” to 1” diameter pipe. But there are 3 main factors that determine the correct water supply line size, which is also referred to as the water service line.

What size is a standard water pipe fitting?

You can join modern 15mm pipe to 1/2 inch imperial and 28mm to 1 inch using standard metric compression fittings, but to connect 22mm pipe to 3/4 inch you'll need a 22mm compression fitting with a special oversize olive. For soldered joints, there are metric/imperial connectors in the relevant sizes.

What size is a standard water fitting?

Generally speaking, the main pipeline from the street to your home is either ¾ or 1 inch in diameter. Supply pipes are ¾ inch in diameter and individual components are ½ inch in diameter.

What size is a typical water service line?

The water service supply line delivers potable water to your home from the city water main. The water service line for a residential home is typically a ¾” to 1” pipe that can be seen entering your building near the water meter.

How do you tell if a pipe is 3/4 or 1/2?

The easiest way to tell what size plumbing pipes you have is to look at the pipe itself. All plumbing pipes and fittings will have the NPS printed or labeled on the pipe.

How to Size Your Water Lines (PEX & Copper)

How do I tell what size water pipe I have?

How do you measure pipe diameter? To find it, measure around the circumference of the pipe with flexible measuring tape. Divide the circumference by pi, or about 3.14159. For example, if the circumference is 12.57 inches (319 mm), you would divide by pi, and get an outside diameter of about 4 inches (100 mm).

Should I use 3/4 or 1 inch sprinkler pipe?

Consider the capacity of your irrigation system and the potential for future expansion. If you anticipate the need to add more sprinklers or increase the water flow in the future, opting for a larger pipe size like 1" can accommodate potential growth and prevent the need for costly modifications down the line.

What is the standard water line connection?

These water lines typically range in size from 3/4” to 4″ in diameter, and are connected to the main supply line. Faucets and valves control the water flow for each plumbing fixture. The main line immediately leads to water ready for cold water use. There's an additional step for hot water.

How many fixture units are on a 3/4 water line?

An existing 3/4" water service line cannot support more than a total of 19 fixture units 1-1/4" meters are not available Fixture counts with a total of 35-59 can use one of the following: 1-1/2 tap, 1-1/2" service line and 1-1/2" meter or 1-1/2 tap, 1-1/4" service line and 1" meter.

What size water pipe from well to house?

For most homes, a 3/4-inch line might be sufficient, but a 1-inch line is often better to ensure a plentiful supply of water. In rural settings, a 1 and 1/4-inch plastic line from the well to the home is advisable. Pipe Material: PVC pipe is common due to its strength, corrosion resistance, and sunlight resistance.

How do I know my fitting size?

Measure the inside diameter (ID) of the female thread and the outside diameter of the male thread (OD). This number will be used to figure out the size of the thread. To find the nominal size, count the threads on a fitting and look at the thread chart earlier in this guide.

What size is a normal water hose fitting?

Hose diameters range from 3/8 inch, 1/2 inch and 3/4 inch. The bigger the diameter, the more water is delivered. The most common garden hose thread size is 3/4 inch.

What type of pipe is used for main water lines?

Polyvinyl Chloride (PVC) Pipe PVC pipes are widely used in new water main connections. However, PVC is one of the oldest synthetic material in use for many other applications. PVC is thermoplastic and can be softened and molded. This means that PVC pipes are ideal for trenchless construction and installation.

Is PEX better than copper?

Copper pipes can last anywhere from six months to the life of a building. But PEX tubing, when operating within its pressure and temperature ratings, has a predicted life expectancy of 50 years per PPI TR-3.

Who is responsible for the water line from street to house?

Who is Responsible for the Water Line From the Street to Your House? Water service lines within the bounds of your property are considered your personal responsibility to maintain, while public water pipes outside of private property lines are the city's responsibility.

What size is a residential main water line?

A typical one-family house is supplied by a 1″ water service line. A one-family house typically has the following plumbing fixtures present: Kitchen sink. Laundry tray.

Is 3/4 PEX big enough for main water line?

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.

How many toilets can you put on a 4 inch line?

4″ waste line can support 90 DFU's, Toilets can be 3–4 DFU's depending on how many gallons per flush. So, 22 toilets if they use a lot of water.

How do you measure water line fittings?

Wrap a string around the pipe (if it's a male thread) and mark where the string touches. Determine the length between the end of the string and the touch point, which gives you its circumference. To get diameter, divide the circumference by pi (3.14159). You may need to convert decimal to fraction.

What is a water line fitting?

A fitting (“adapter” or “connector”), in a broad sense, is a plumbing component used to connect two straight pipe sections in order to: Extend the line; Alter the direction of a line; Make varying sizes or shapes of pipes compatible with each other; Regulate (and, occasionally, measure) fluid flow.

What is the most common sprinkler pipe size?

One of the most commonly used sizes of PVC pipe for irrigation systems are 13mm, 19mm, and 25mm. For irrigation laterals, PVC pipes that are at least ¾” thick (19.05mm) are preferred since those that are ½” thick (12.7mm) clog much faster and often.

How deep should sprinkler pipes be buried?

A: My recommendation is to bury sprinkler lines 8-12 inches. I usually try to keep a standard depth of 10" because it provides more safety if I need to do some type of ground work so I don't have to worry about hitting lines. A walk-behind rototiller generally won't go deeper than 8".

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