The fact is no matter what flexible hose you buy 7 8 1 2 3 8 inch for the water supply on sink and toilets the internal diameter is the same about 1 4.
Sink shut off valve size.
Shut off valves come with different sized outlet ports.
These inexpensive little valves rarely get used and when they do sometimes they leak.
Monster master brass angle stop valve shut off quarter turn water sink bathroom toilet kitchen shower plumbing 5 8 od.
Multi turn shut off valves have a handle that when tightened forces a rubber gasket onto a seat in the middle of the valve that restricts water.
1 2 nom x 3 8 od comp.
Several considerations dictate which is the best water shut off valve for your needs including the size of the inlet diameter and outlet diameter as well as how the valve is operated.
Faucets connectors aren t completely standardized but most have.
The two most common are 3 8 and 1 2 inch compression or male pipe thread.
Under sink shutoff valves also called fixture shutoffs or stop valves allow you to turn off the water to the sink or other fixture without having to use the home s main shutoff.
The inlet must match the supply pipe and it can be a 1 2 inch female pipe thread fpt connector for galvanized pipes a 1 2 inch compression or sweat connector for copper pipes or a 1 2 inch barbed connector for pex pipes.