Are all angle stops the same size?

Are all angle stops the same size, no, angle stops come in various sizes for inlet and outlet connections, though residential plumbing uses common standard sizes, so it is important to match size to existing pipe and supply line. Most common residential angle stop sizes are 1/2 inch inlet and 3/8 inch outlet, where inlet is size of water pipe coming from wall, typically 1/2 inch copper, PEX, or CPVC, and outlet is size of faucet supply line, typically 3/8 inch compression that connects to braided stainless steel supply line to faucet. Other common combinations include 1/2 inch inlet by 1/2 inch outlet, 3/8 inch inlet by 3/8 inch outlet, and 1/2 inch inlet by 1/4 inch outlet for some toilets or ice makers. Commercial or larger applications may use 3/4 inch inlet angle stops for higher flow. Inlet connection types also vary, including compression, threaded IPS, sweat solder, and push fit like SharkBite, each requiring different installation method. Outlet types include compression and threaded. So while 1/2 by 3/8 inch compression angle stop is most common for under sink and toilet in homes, not all angle stops are same size, you must check existing pipe size and supply line size before buying replacement, and bring old valve to store to match if unsure.