Install New Water Line — Connect New Line to Shutoff Valve
Part of project
How to Fix a Leak at a Faucet Supply Line Connection · Step 7 of 9
In this video
Take the new water supply line and first connect the metal end to the shut-off valve, finger-tightening it initially. Then, align the plastic nut with the threaded connection on the bottom of the toilet tank and hand-tighten it until it is snug but not forced. Finally, return to the shut-off valve and use the wrench to give the metal nut a final tightening to ensure it's secure.
Goal: Connect the new water supply line to the toilet and shut-off valve.
- Do not use a wrench on the plastic toilet tank connection; hand-tightening is all that is needed to create a seal and prevent cracking.
- It is acceptable for a longer supply line to form a gentle loop.
Used in this video
- Wrench (brand: Craftsman, Tool Type: Hand Tools, Power Source: Manual, Material Compatibility: Metal, Size/Capacity: 5/8 inch, Durability: High, Cost: $10-25, Specific Design: Combination wrench) — Tightening the metal nut on the water supply line at the shut-off valve.
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FAQs
How long does this repair typically take for a beginner, and what's the real difficulty level?
This is a beginner-friendly project, usually taking 30-60 minutes once you have the right parts. The most challenging aspect is often working in tight, cramped spaces under the sink. Taking your time to ensure proper alignment and avoid cross-threading is key to success.
How do I know which new supply line to buy, especially regarding size and length?
Before purchasing, measure the length of your old supply line from end to end. Note the connection sizes: faucet connections are typically 1/2 inch FIP, and shutoff valve connections are commonly 3/8 inch compression. Bringing the old line to the store or taking a picture of the connections can help ensure you get an exact match.
I replaced the supply line, but it's still leaking. What should I check next?
First, ensure both ends of the new supply line are hand-tightened, then given an additional quarter to half-turn with a wrench – avoid overtightening. Check that the rubber washer (gasket) inside the supply line nuts is properly seated and undamaged. If the leak persists, the shutoff valve itself might be old and failing, or the connection point at the faucet could be compromised.
What if I can't turn off the water supply to my faucet, or the shutoff valve itself is leaking?
If the existing shutoff valve is stuck, leaking, or won't completely stop the water flow, you will need to turn off the main water supply to your entire house before proceeding. In such cases, or if you're uncomfortable with the main shutoff, it might be best to contact a qualified plumber, as replacing a main shutoff or a frozen fixture shutoff is a more advanced task.
Install New Water Line — Connect New Line to Shutoff Valve
Part of project
How to Fix a Leak at a Faucet Supply Line Connection · Step 7 of 9
In this video
Take the new water supply line and first connect the metal end to the shut-off valve, finger-tightening it initially. Then, align the plastic nut with the threaded connection on the bottom of the toilet tank and hand-tighten it until it is snug but not forced. Finally, return to the shut-off valve and use the wrench to give the metal nut a final tightening to ensure it's secure.
Goal: Connect the new water supply line to the toilet and shut-off valve.
- Do not use a wrench on the plastic toilet tank connection; hand-tightening is all that is needed to create a seal and prevent cracking.
- It is acceptable for a longer supply line to form a gentle loop.
Used in this video
- Wrench (brand: Craftsman, Tool Type: Hand Tools, Power Source: Manual, Material Compatibility: Metal, Size/Capacity: 5/8 inch, Durability: High, Cost: $10-25, Specific Design: Combination wrench) — Tightening the metal nut on the water supply line at the shut-off valve.
Frequently Asked Questions
How long does this repair typically take for a beginner, and what's the real difficulty level?
This is a beginner-friendly project, usually taking 30-60 minutes once you have the right parts. The most challenging aspect is often working in tight, cramped spaces under the sink. Taking your time to ensure proper alignment and avoid cross-threading is key to success.
How do I know which new supply line to buy, especially regarding size and length?
Before purchasing, measure the length of your old supply line from end to end. Note the connection sizes: faucet connections are typically 1/2 inch FIP, and shutoff valve connections are commonly 3/8 inch compression. Bringing the old line to the store or taking a picture of the connections can help ensure you get an exact match.
I replaced the supply line, but it's still leaking. What should I check next?
First, ensure both ends of the new supply line are hand-tightened, then given an additional quarter to half-turn with a wrench – avoid overtightening. Check that the rubber washer (gasket) inside the supply line nuts is properly seated and undamaged. If the leak persists, the shutoff valve itself might be old and failing, or the connection point at the faucet could be compromised.
What if I can't turn off the water supply to my faucet, or the shutoff valve itself is leaking?
If the existing shutoff valve is stuck, leaking, or won't completely stop the water flow, you will need to turn off the main water supply to your entire house before proceeding. In such cases, or if you're uncomfortable with the main shutoff, it might be best to contact a qualified plumber, as replacing a main shutoff or a frozen fixture shutoff is a more advanced task.