Toilet Hose Pipe. Do you need a vent pipe for a toilet? And the size of this vent pipe depends on your local plumbing code.

Inspect your roof for a vent pipe. Locate an exit pipe on the side of the building. You'll need to install the fill valve (good choice of valve btw) then offer up the flexi so you can see where you need to cut the copper pipe.

A Flexible Line Is Ideal Because Its Pliability Allows You To Bend The Part As Needed.
Sometimes you forget to tighten the water inlet valve of the pipe. Toilet hoses (also known as speedways) are easy to overlook, but it’s important to replace them when they get worn out. This goes up when the toilet handle is pushed down and stops water from constantly flowing into the toilet bowl.
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You'll need to install the fill valve (good choice of valve btw) then offer up the flexi so you can see where you need to cut the copper pipe. If the plastic nut connection end is leaking, slightly hand. It could be an increase in water pressure from the main tank, or water supply authority.
And The Size Of This Vent Pipe Depends On Your Local Plumbing Code.
Learn about the different tubing sizes and materials. Sometimes the water pressure in the hose increases due to which the refill hose keeps coming out. Get a hose long enough to easily span the distance without coiling over on itself.