## How to Install Kitchen Sink Plumbing with PEX
Installing kitchen sink plumbing with PEX (cross-linked polyethylene) is a relatively simple and straightforward task that can be completed in a few hours with the right tools and materials. PEX is a flexible and durable type of plastic pipe that is becoming increasingly popular for plumbing applications due to its ease of use and affordability.
**Materials:**
* PEX pipe (1/2-inch or 3/4-inch diameter)
* PEX fittings (elbows, tees, couplings)
* PEX crimping tool
* PEX cutter
* Measuring tape
* Hacksaw
* Plumber’s tape
* Sink strainer
* Drain pipe
* Trap
* Shut-off valves
**Tools:**
* Pipe wrench
* Adjustable wrench
* Screwdriver
* Utility knife
**Step 1: Remove the Old Plumbing**
If you are replacing an existing sink, the first step is to remove the old plumbing. Turn off the water supply to the sink and disconnect the water lines from the faucet. Remove the drain pipe and trap from the sink.
**Step 2: Measure and Cut the PEX Pipe**
Measure the distance from the water supply lines to the faucet and cut the PEX pipe to the appropriate length. Use a hacksaw or PEX cutter to ensure a clean cut.
**Step 3: Crimp the PEX Fittings**
Attach PEX fittings to the ends of the PEX pipe. Use a crimping tool to secure the fittings in place. Make sure to insert the pipe fully into the fitting and crimp the fitting according to the manufacturer’s instructions.
**Step 4: Assemble the Faucet**
Attach the faucet to the sink and connect the water lines to the faucet. Use plumber’s tape to seal the connections.
**Step 5: Install the Sink**
Set the sink in place and connect the drain pipe and trap to the sink. Tighten the drain pipe and trap securely.
**Step 6: Install the Shut-Off Valves**
Install shut-off valves under the sink to control the water supply to the faucet. Connect the shut-off valves to the water supply lines.
**Step 7: Reconnect the Water Supply**
Turn on the water supply to the sink and check for leaks. If there are any leaks, tighten the fittings or connections as needed.
**Additional Tips:**
* Use PEX pipe that is the correct size for your application. 1/2-inch PEX pipe is typically used for water supply lines, while 3/4-inch PEX pipe is used for drain lines.
* Make sure to cut the PEX pipe cleanly and squarely. A clean cut will ensure a good seal when the fittings are crimped.
* Do not over-tighten the fittings. Over-tightening can damage the fittings or the PEX pipe.
* If you are not comfortable working with plumbing, it is best to hire a licensed plumber to install your kitchen sink plumbing.
## PEX Plumbing Advantages
* **Flexibility:** PEX pipe is extremely flexible, which makes it easy to work with and install. It can be bent and shaped to fit into tight spaces.
* **Durability:** PEX pipe is very durable and can withstand high water pressure and temperatures. It is also resistant to corrosion and scale buildup.
* **Affordability:** PEX pipe is relatively inexpensive compared to other types of plumbing pipe.
* **Ease of installation:** PEX pipe is easy to cut and connect, making it a good choice for DIY plumbing projects.
## PEX Plumbing Disadvantages
* **Higher expansion rate:** PEX pipe has a higher expansion rate than other types of plumbing pipe. This can cause the pipe to expand and contract when exposed to changes in temperature.
* **Not as strong as copper or CPVC:** PEX pipe is not as strong as copper or CPVC pipe. It can be damaged if it is punctured or crushed.
* **Can be discolored by sunlight:** PEX pipe can be discolored by sunlight. It is important to protect the pipe from direct sunlight if it is installed outdoors.