If you notice that water is dripping from the plastic supply line that is attached to the toilet tank in your master bathroom, remove the damaged line and replace it with a durable stainless steel line by completing the steps below. A stainless steel line is flexible and won't be prone to pinholes or tears, making it an item that is a wise choice to use as a replacement for the necessary repair.

Materials

• sponge mop
• bucket of warm water
• disinfectant 
• towels
• drop cloth
• disposable gloves
• adjustable wrench
• stainless steel supply line

Eliminate Water And Clean Flooring

Turn off the water valve that is secured to one end of the supply line. Flush the toilet to drain water from the tank. By doing so, water won't be likely to drip a lot onto the flooring while you are replacing the line. Use a sponge mop to soak up water that is underneath the supply line.

Pour a small amount of disinfectant into a bucket of water. Dip a clean mop into the cleaning product and move the mop over the flooring that is underneath the water supply line. Use a thick towel to dry the floor. Lay a drop cloth across the clean flooring to protect the surface from minor drips while you are replacing the damaged line.

Remove The Damaged Line And Replace It With A Stainless Steel Line

Cover your hands with rubber or plastic disposable gloves. Use a wrench to loosen the nuts that are secured to the ends of the plastic supply line. Grasp the line and gently pull it loose from the valve and toilet tank. Slide one nut onto one end of the stainless steel supply line. Align the nut over the opening in the toilet tank. Use your fingers to begin tightening the nut. Attach a nut to the opposite end of the supply line. Align the nut over the opening that is next to the water valve. Again, use your fingers to begin tightening the nut.

Use an adjustable wrench to finish tightening both pieces of hardware. Avoid tightening the nuts too much because the threading on the hardware pieces could become damaged. Turn on the water valve and wait for the toilet's tank to fill. Afterward, flush the toilet and inspect the stainless steel line to ensure that water does not drip from it. If you do notice that water is dripping, tighten the hardware pieces a little bit more. Call a licensed plumber for more help.