What Size Supply Line Is Needed For A Kitchen Faucet (Delta, Kohler, Moen, Pfister, Glacier Bay, Ikea)

Are you confused about the size of the supply line for your kitchen faucet?

Don’t worry; we’ve got you covered! Surprisingly, the supply line size for Delta, Kohler, Moen, Pfister, Glacier Bay, and Ikea faucets is standardized.

Typically, these faucets have a ½ inch supply line tubing to a 3/8 inch compression fitting. However, the Ikea faucet has a 3/8 inch supply line with threaded male connections and a ½ inch female coupling.

But what if you have a short-size faucet water supply line? Don’t worry, and you can easily fix this problem using a compression coupling.

In this article, we will discuss the supply line size for these branded faucets in detail, so you can quickly determine the correct size for your faucet. Keep reading to know more.

What is the Delta Faucet Supply Line Size?

The Delta faucet supply line size is typically measured at 3/8 inches in OD (Outside diameter) as compression fitting, and ½ inches in diameter is the most common supply line diameter under a sink.

The supply line types and, thus, the size differs depending on the materials, if it is manufactured from flexible plastics or braided metals, and the accessories that usually go to your kitchen faucet.

Usually, the stainless steel or copper pipes feature a ¾ inches size main water supply line where the branch line diameter is about ½ inch. However, the Delta faucet supply tube made from stainless steel has a 3/8 inches chrome-plated brass nuts supply line and is considered a universal fit.

With this size, the faucet supply tube securely transfers hot and cold water from the supply line to the Delta kitchen faucet. Here, the hot supply feed will be on the left side, whereas the cold supply line feed will be on the right side under the sink.

Here, the sink supply line size is ½ inches, mainly a faucet connector providing sufficient water flow at the standard pressure. And this ½ inches supply tube ends with a shutoff valve, which determines what connector size should be on your kitchen faucet hose.

What is the Kohler Faucet Supply Line Size?

The Kohler faucet supply line typically uses ½ inches size supply tubing with the 3/8 inches size compression fitting. With the 3/8 inch diameter size, this faucet connects to the angle stop though it depends on the angle stop type, pipes, etc.

However, fortunately, the compression-thread discharge ports of most valves are usually 3/8 inch in diameter, and the Kohler faucet supply line size is no exception. The supply line of the faucet connects these discharge ports to its intake ports using 3/8 inches NPT.

And, here also, two ½ inches of water supply pipes enter the cabinet under the sink. So they can supply water to the Kohler faucet. Moreover, like the previous one, the line on the sink’s left side gives hot water, and the right side pipe provides cold water. 

Here, the set of angle stop valves connects the above two pipe ends (one male pipe thread of about ½ inches in size and another is an intake port of about ½ inches in size). 

After incisive research, I have discovered that the recent Kohler kitchen faucet models feature attached built-in supply lines. Therefore, when connecting the supply pipes, they directly connect to the Kohler faucet using a nut and a gasket.

The Kohler faucet usually uses a brass or copper-type water supply line with a long life expectancy. Yet, to install the faucet with the supply line correctly, you must require special tools and excellent plumbing and installation skills. 

What is the Moen Faucet Supply Line Size?

The supply line size of the Moen faucet is standard 3/8 inches OD as compressor fittings and ½ inches in diameter as a male connector.

I have already mentioned that the supply line sizes vary based on the Moen faucet models. 

However, the thing is, most Moen faucets; for example, Moen Harlon series model faucets, come with flexible and pre-attached supply lines where the screw-on compression fitting is about 3/8 inches in size. 

For the Moen faucet model where the line is pre-attached, you should check the shutoff valve size under the sink to see if it is ½ inch or 3/8 inch. 

And if you found that the size is ½ inch, in this case, you need to connect the water supply tubes with compressor adapters of 3/8 inch to ½ inch diameter. Replacing the shutoff valves is an excellent idea since it helps to prevent water leak issues or other repair incidents.

But, if there are no pre-attached supply lines, you will require separate yet flexible supply tubes. While installing the new Moen faucet model, you need to connect the Moen faucet’s cold and hot supply lines to its shutoff valves using 3/8-inch compressor fittings.

And while doing so, you need to thread the compression nut onto the resembling shutoff valves for each supply line.

You must also tighten the compression nut and ensure these flexible supply tubes will not interfere with the faucet’s spray hose. Otherwise, they will be kinked and ultimately will cause damage to the water supply lines.

What is the Pfister Faucet Supply Line Size?

The faucet supply line connectors are not standardized entirely, as the size varies according to the models. The Pfister faucet supply line has a 3/8 inch compression fitting and ½ inch male supply line thread. 

The stub-out pipes, considered branch pipes located under the sink connected to the 3/8 inch primary supply tubes, have a diameter of about ½ inches. These pipes can be Copper, CPVC, or PB pipes. 

And, it doesn’t matter if the shutoff valves of the tubes feature either compression fittings or threaded. They always come with a ½-inch-diameter inlet port. So they can connect to the water supply pipe.

However, as you know, the outlet ports of the shutoff valves are of different sizes; the supply hoses come in various connector configurations, such as 3/8-inch OD and ½-inch female pipe connectors. Besides, they also have various lengths. 

For this reason, you can easily fit the supply line into the valves and the Pfister faucet while installing the new one. Besides, for the cold and hot – two water supply pipes, they must terminate properly with the shutoff valves.

And this Pfister supply line size makes the connection more convenient since the supply hose connector sizes match perfectly on the shutoff valve outlets and the Pfister faucets.

What is the Glacier Bay Faucet Supply Line Size?

Like the previous faucets, the Glacier Bay supply line size is 3/8 inches in diameter as a compressor fitting on the supply line side and ½ inches as a male thread connector on the faucet side.

When the Glacier Bay faucet is attached to a sink, it must be attached to the shutoff valves on the main supply lines. And for this, a coupling nut is used to secure the supply line to the faucet tailpiece; it can be either brass or plastic entirely, depending on the manufacturer.

Besides, you will find three types of supply lines mainly – factory attached supply lines, flexible copper, and braided supply lines. Well, whatever the type, the most common size diameter for a supply pipe under a sink is ½ inch. 

Moreover, the main pipe from the main supply line and the heater feed are usually 3/8 inches in diameter for the Glacier Bay faucet. The branch lines of this faucet supplying water to individual fixtures are ½ inch in size.

The inlet port of the faucet should match the supply pipe. Here, a galvanized pipe will be a ½ inch FPT connector (female pipe thread), a copper pipe will be a ½ inch compression connector, and a PEX pipe will be a ½ inch barbed connector. Well, the outlet port diameter will be in a size that interests you. 

The supply hoses of the faucet can come with one of the three female connector types, such as ½ inch SJ (slip joint), ½ inch OD, and 3/8 inch OD. However, the supply hose comes with a 3/8 inch OD connection for the Glacier Bay faucet, although the supply hose length will vary according to the model.

What is the Ikea Faucet Supply Line Size?

The Ikea faucet comes with 3/8 inches threaded male connections and a ½ inches size female couplings supply line. This supply line size is quite different from American plumbing.

The reason is that the male connector end of the water supply line valves is smaller than the female end of your Ikea faucet hose. Therefore, this slightly large female coupling end will not fit onto the male threaded connection, which is frustrating.

And to fix this problem, you have to make an end so it can connect to the 3/8 inches male threaded supply valves. If you want to solve this using a reduction coupling, know that you will not find any. Thus, you need to size up the sink properly.

You will require a standard faucet hose with a ½ inch male end on the faucet side and a 3/8-inch female end on the supply line side. After grabbing this pair, connect this 3/8 inch faucet hose’s female end to the 3/8 inch Ikea faucet’s male supply line.

Besides, you also need to connect the left ½ inches female coupling supply end of your Ikea faucet hose to the ½ inch male end on the faucet side.

And by doing so, congratulations! Your plumbing project is done with this Ikea faucet supply line size. 

Final Verdict

Knowing the water supply line sizes of the faucets is necessary since, without installing the right size, the supply line won’t get the standard pressure and will not deliver enough water flow. So, you can see size matters!

However, at the end of the article, you now know about the water supply line sizes of the Delta, Kohler, Moen, Pfister, Glacier Bay, and Ikea faucets. So, hopefully, it will now be easy for you to attach the supply lines properly under your installing these kitchen faucets.

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