Remove the Old Supply Line — Remove Old Supply Line and Purchase Replacement
Part of project
How to Fix a Leak at a Faucet Supply Line Connection · Step 5 of 9
In this video
With the water supply still off, use pliers to loosen the coupling nut that connects the supply line to the shut-off valve. Once it is loose, finish unscrewing it by hand and remove the old supply line completely.
Goal: Disconnect the clogged supply line
Used in this video
- Pliers (Tool Type: Pliers, Power Source: Manual, Material Compatibility: Metal, Size/Capacity: Medium, Durability: Standard, Cost: $10-25, Pliers Jaw Type: Serrated) — Loosening the coupling nut on the toilet 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.
Remove the Old Supply Line — Remove Old Supply Line and Purchase Replacement
Part of project
How to Fix a Leak at a Faucet Supply Line Connection · Step 5 of 9
In this video
With the water supply still off, use pliers to loosen the coupling nut that connects the supply line to the shut-off valve. Once it is loose, finish unscrewing it by hand and remove the old supply line completely.
Goal: Disconnect the clogged supply line
Used in this video
- Pliers (Tool Type: Pliers, Power Source: Manual, Material Compatibility: Metal, Size/Capacity: Medium, Durability: Standard, Cost: $10-25, Pliers Jaw Type: Serrated) — Loosening the coupling nut on the toilet 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.