Attaching Valve to PEX Tubing — Run PEX Water Supply Lines
Part of project
How to Rough-In Plumbing for a Bathroom Vanity · Step 4 of 5
In this video
Position the valve in the wall opening. Measure the distance from the existing hot and cold water supply lines to the corresponding valve inlets. Cut new lengths of PEX tubing to bridge these gaps. Slide crimp rings onto both ends of the new PEX tubes. Attach one end to the existing water line elbow and the other to the valve inlet. Connect the PEX tubing for the shower outlets to the corresponding ports on the valve. If you're installing only two devices, cap the unused third outlet. Use a crimping tool to secure all PEX connections. Finally, mount the valve assembly securely to the wooden cross members (stringers) in the wall using the integrated mounting brackets and screws.
Goal: Connect valve to plumbing and mount securely
- For a two-device system, the primary showerhead should be connected to outlet #1, and the secondary device (e.g., handheld shower) to outlet #2. Outlet #3 should be capped.
Used in this video
- Tape Measure (brand: DeWalt, Tool Type: Measuring Tools) — Measuring PEX tubing to the correct length.
- PEX Tube Cutter (Tool Type: Cutting tools) — Cutting the PEX tubing.
- Crimping Tool (Tool Type: Plumbing Tools) — Securing all PEX connections with crimp rings.
- Power Drill/Driver (brand: Ridgid, Tool Type: Power tools, Power Source: Battery) — Driving screws to mount the valve to the wall stringers.
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FAQs
As an "intermediate" project, how challenging is roughing in plumbing for someone with limited prior plumbing experience?
While intermediate, this project requires precision for proper drain slope, watertight PEX connections, and adherence to plumbing codes. Take your time, double-check all measurements and connections, and be prepared to consult diagrams and local regulations. Mistakes in plumbing can be very costly to fix later.
Do I need all the specialized tools listed, like the PEX crimp tool and specific tubing cutters, or are there more budget-friendly alternatives?
Specialized PEX tools are highly recommended for reliable, leak-free connections that meet code. While some PEX systems offer push-to-connect fittings, traditional crimping or expansion tools provide a more robust rough-in. Renting expensive tools like PEX crimpers can be a cost-effective alternative for a one-time project.
Is it always necessary to get a permit and have an inspection for new plumbing rough-in work like this bathroom vanity?
Yes, new plumbing installations almost always require permits and inspections to ensure safety and compliance with local building codes. Failing to obtain permits can lead to costly rework, fines, or issues when selling your home. Always check with your local building department before starting any plumbing work.
What are the most common mistakes DIYers make during a plumbing rough-in, and how can I avoid them, especially regarding leaks?
Common mistakes include improper drain slope leading to clogs, poorly sealed DWV joints, and incorrect PEX connections causing leaks. To avoid these, ensure all PVC joints are dry-fitted and then properly cemented, and that PEX connections are correctly crimped/expanded and burr-free. Always pressure-test the system thoroughly before closing the wall.
Attaching Valve to PEX Tubing — Run PEX Water Supply Lines
Part of project
How to Rough-In Plumbing for a Bathroom Vanity · Step 4 of 5
In this video
Position the valve in the wall opening. Measure the distance from the existing hot and cold water supply lines to the corresponding valve inlets. Cut new lengths of PEX tubing to bridge these gaps. Slide crimp rings onto both ends of the new PEX tubes. Attach one end to the existing water line elbow and the other to the valve inlet. Connect the PEX tubing for the shower outlets to the corresponding ports on the valve. If you're installing only two devices, cap the unused third outlet. Use a crimping tool to secure all PEX connections. Finally, mount the valve assembly securely to the wooden cross members (stringers) in the wall using the integrated mounting brackets and screws.
Goal: Connect valve to plumbing and mount securely
- For a two-device system, the primary showerhead should be connected to outlet #1, and the secondary device (e.g., handheld shower) to outlet #2. Outlet #3 should be capped.
Used in this video
- Tape Measure (brand: DeWalt, Tool Type: Measuring Tools) — Measuring PEX tubing to the correct length.
- PEX Tube Cutter (Tool Type: Cutting tools) — Cutting the PEX tubing.
- Crimping Tool (Tool Type: Plumbing Tools) — Securing all PEX connections with crimp rings.
- Power Drill/Driver (brand: Ridgid, Tool Type: Power tools, Power Source: Battery) — Driving screws to mount the valve to the wall stringers.
Frequently Asked Questions
As an "intermediate" project, how challenging is roughing in plumbing for someone with limited prior plumbing experience?
While intermediate, this project requires precision for proper drain slope, watertight PEX connections, and adherence to plumbing codes. Take your time, double-check all measurements and connections, and be prepared to consult diagrams and local regulations. Mistakes in plumbing can be very costly to fix later.
Do I need all the specialized tools listed, like the PEX crimp tool and specific tubing cutters, or are there more budget-friendly alternatives?
Specialized PEX tools are highly recommended for reliable, leak-free connections that meet code. While some PEX systems offer push-to-connect fittings, traditional crimping or expansion tools provide a more robust rough-in. Renting expensive tools like PEX crimpers can be a cost-effective alternative for a one-time project.
Is it always necessary to get a permit and have an inspection for new plumbing rough-in work like this bathroom vanity?
Yes, new plumbing installations almost always require permits and inspections to ensure safety and compliance with local building codes. Failing to obtain permits can lead to costly rework, fines, or issues when selling your home. Always check with your local building department before starting any plumbing work.
What are the most common mistakes DIYers make during a plumbing rough-in, and how can I avoid them, especially regarding leaks?
Common mistakes include improper drain slope leading to clogs, poorly sealed DWV joints, and incorrect PEX connections causing leaks. To avoid these, ensure all PVC joints are dry-fitted and then properly cemented, and that PEX connections are correctly crimped/expanded and burr-free. Always pressure-test the system thoroughly before closing the wall.