Connecting PEX Supply Lines — Install Supply Stub-Outs and Shutoff Valves
Part of project
How to Rough-In Plumbing for a Bathroom Vanity · Step 6 of 8
In this video
Connect the hot and cold water supply lines using PEX tubing. This valve has built-in PEX connections. Slide a PEX crimp ring onto the blue (cold) PEX tube, and push the tube onto the cold inlet of the valve. Position the crimp ring 1/8 to 1/4 inch from the end of the tube and use a PEX crimping tool to create a secure connection. For the hot water side, connect a 90-degree PEX fitting to a length of red (hot) PEX tubing, then connect the other end of the 90-degree fitting to the hot inlet on the valve, crimping both connections securely.
Goal: Connect water supply to the valve
- The video shows special PEX fittings with a red plastic stop. This stop ensures the crimp ring is placed in the perfect position automatically, simplifying the process.
Used in this video
- PEX Crimping Tool (Tool Type: Pipe Repair Tool, Power Source: Manual, Crimping Tool Size: 1/2 inch) — Securing the PEX crimp rings to create a watertight seal.
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FAQs
How difficult is it to rough-in plumbing for a vanity, and how long should I expect it to take?
This project is rated "intermediate" because it requires precise measurements, proper pipe joining techniques, and an understanding of plumbing codes. For a DIYer with some experience, expect 8-16 hours of work, depending on existing wall access and any unforeseen issues. Costs can range from $150-$300 for materials, assuming you already own basic tools.
What are the most crucial safety precautions I should take when roughing-in plumbing?
Always shut off the main water supply before cutting into existing lines to prevent flooding. Wear appropriate personal protective equipment (PPE) like safety glasses, gloves, and hearing protection, especially when using power tools like drills and hole saws. Be mindful of electrical wires inside walls when drilling or cutting.
The guide mentions PEX for supply lines; can I use copper or CPVC instead, and what are the pros of PEX?
While copper and CPVC are alternatives, PEX is often preferred for DIY projects due to its flexibility, ease of installation (fewer fittings, no soldering), and resistance to freezing. However, PEX requires specific crimp or expansion tools. If you're comfortable with soldering, copper is a durable choice, and CPVC offers a rigid, solvent-weld option.
What are the most common mistakes DIYers make when roughing-in a vanity's drain and supply lines?
A common mistake is incorrect drain slope, leading to clogs – ensure a 1/4 inch per foot slope for DWV lines. Another error is misplacing supply stub-outs, making fixture installation difficult; always double-check vanity and sink specifications. Also, failing to properly prime and cement PVC joints can cause leaks.
Connecting PEX Supply Lines — Install Supply Stub-Outs and Shutoff Valves
Part of project
How to Rough-In Plumbing for a Bathroom Vanity · Step 6 of 8
In this video
Connect the hot and cold water supply lines using PEX tubing. This valve has built-in PEX connections. Slide a PEX crimp ring onto the blue (cold) PEX tube, and push the tube onto the cold inlet of the valve. Position the crimp ring 1/8 to 1/4 inch from the end of the tube and use a PEX crimping tool to create a secure connection. For the hot water side, connect a 90-degree PEX fitting to a length of red (hot) PEX tubing, then connect the other end of the 90-degree fitting to the hot inlet on the valve, crimping both connections securely.
Goal: Connect water supply to the valve
- The video shows special PEX fittings with a red plastic stop. This stop ensures the crimp ring is placed in the perfect position automatically, simplifying the process.
Used in this video
- PEX Crimping Tool (Tool Type: Pipe Repair Tool, Power Source: Manual, Crimping Tool Size: 1/2 inch) — Securing the PEX crimp rings to create a watertight seal.
Frequently Asked Questions
How difficult is it to rough-in plumbing for a vanity, and how long should I expect it to take?
This project is rated "intermediate" because it requires precise measurements, proper pipe joining techniques, and an understanding of plumbing codes. For a DIYer with some experience, expect 8-16 hours of work, depending on existing wall access and any unforeseen issues. Costs can range from $150-$300 for materials, assuming you already own basic tools.
What are the most crucial safety precautions I should take when roughing-in plumbing?
Always shut off the main water supply before cutting into existing lines to prevent flooding. Wear appropriate personal protective equipment (PPE) like safety glasses, gloves, and hearing protection, especially when using power tools like drills and hole saws. Be mindful of electrical wires inside walls when drilling or cutting.
The guide mentions PEX for supply lines; can I use copper or CPVC instead, and what are the pros of PEX?
While copper and CPVC are alternatives, PEX is often preferred for DIY projects due to its flexibility, ease of installation (fewer fittings, no soldering), and resistance to freezing. However, PEX requires specific crimp or expansion tools. If you're comfortable with soldering, copper is a durable choice, and CPVC offers a rigid, solvent-weld option.
What are the most common mistakes DIYers make when roughing-in a vanity's drain and supply lines?
A common mistake is incorrect drain slope, leading to clogs – ensure a 1/4 inch per foot slope for DWV lines. Another error is misplacing supply stub-outs, making fixture installation difficult; always double-check vanity and sink specifications. Also, failing to properly prime and cement PVC joints can cause leaks.