Remove Old Fill Valve — Disconnect and Remove Old Supply Line
Part of project
How to Replace a Toilet's Flexible Water Supply Line · Step 3 of 6
In this video
Using an adjustable wrench, loosen the nut connecting the water supply line to the fill valve shank underneath the tank. Once loose, unscrew it by hand. Then, unscrew the large plastic locknut that secures the fill valve to the tank. Lift the old valve assembly out from inside the tank. Use a small tool to pick out the old fiber washer from the supply line fitting.
Goal: Remove Faulty Component
- Be gentle when loosening the nuts to avoid cracking the porcelain tank.
Used in this video
- Adjustable Wrench (Wrench Type: Adjustable wrench) — To loosen the nuts on the water supply line and the fill valve.
- Dental Pick · optional — To easily remove the old fiber washer from the fitting.
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FAQs
What specific type of new water supply line should I use, and what size do I need for my toilet?
You should use a braided stainless steel or polymer supply line for durability and burst protection; plastic ones can degrade. The most common size is 3/8 inch compression for the shut-off valve by 7/8 inch ballcock nut for the toilet tank, often 12-20 inches long depending on the distance between your valve and tank. Always measure your existing line or the distance to be sure.
What's the most critical first step to prevent a flood when starting this project?
The most critical first step is to completely shut off the water supply to the toilet. Locate the shut-off valve behind or near the base of the toilet and turn it clockwise until it stops. After shutting it off, flush the toilet to drain the tank and relieve pressure, ensuring no water will flow when you disconnect the old line.
How long does this toilet supply line replacement project typically take for a beginner, and what's its difficulty level?
This project is considered beginner-level and typically takes most DIYers only 15-30 minutes to complete. The most time-consuming part might be gathering your tools and preparing the work area. With the right tools and preparation, it's a quick and straightforward task.
What should I do if the new supply line leaks after I've installed it and turned the water back on?
If you notice a leak, immediately shut off the water supply to the toilet again. Check both connections to ensure they are hand-tightened, then use your adjustable wrench to give them an additional quarter to half-turn, being careful not to overtighten. Also, confirm the rubber washers are properly seated inside the nuts.
Remove Old Fill Valve — Disconnect and Remove Old Supply Line
Part of project
How to Replace a Toilet's Flexible Water Supply Line · Step 3 of 6
In this video
Using an adjustable wrench, loosen the nut connecting the water supply line to the fill valve shank underneath the tank. Once loose, unscrew it by hand. Then, unscrew the large plastic locknut that secures the fill valve to the tank. Lift the old valve assembly out from inside the tank. Use a small tool to pick out the old fiber washer from the supply line fitting.
Goal: Remove Faulty Component
- Be gentle when loosening the nuts to avoid cracking the porcelain tank.
Used in this video
- Adjustable Wrench (Wrench Type: Adjustable wrench) — To loosen the nuts on the water supply line and the fill valve.
- Dental Pick · optional — To easily remove the old fiber washer from the fitting.
Frequently Asked Questions
What specific type of new water supply line should I use, and what size do I need for my toilet?
You should use a braided stainless steel or polymer supply line for durability and burst protection; plastic ones can degrade. The most common size is 3/8 inch compression for the shut-off valve by 7/8 inch ballcock nut for the toilet tank, often 12-20 inches long depending on the distance between your valve and tank. Always measure your existing line or the distance to be sure.
What's the most critical first step to prevent a flood when starting this project?
The most critical first step is to completely shut off the water supply to the toilet. Locate the shut-off valve behind or near the base of the toilet and turn it clockwise until it stops. After shutting it off, flush the toilet to drain the tank and relieve pressure, ensuring no water will flow when you disconnect the old line.
How long does this toilet supply line replacement project typically take for a beginner, and what's its difficulty level?
This project is considered beginner-level and typically takes most DIYers only 15-30 minutes to complete. The most time-consuming part might be gathering your tools and preparing the work area. With the right tools and preparation, it's a quick and straightforward task.
What should I do if the new supply line leaks after I've installed it and turned the water back on?
If you notice a leak, immediately shut off the water supply to the toilet again. Check both connections to ensure they are hand-tightened, then use your adjustable wrench to give them an additional quarter to half-turn, being careful not to overtighten. Also, confirm the rubber washers are properly seated inside the nuts.