True story: There’s a leak under my bathroom sink. I buy a new connector hose. There’s a tag on the middle of the hose that says “1/2 inch COMP to Valve – 1/2 inch FIP to Faucet”. Sure enough, it fits the valve, but it’s the wrong size for the faucet. The end that fits the valve, however, happens to also be the right size for the faucet.
I return to the hardware store looking for a hose that says “1/2 inch COMP to Faucet – 1/2 inch COMP to Valve”.
Unfortunately (or fortunately), they don’t make such a hose.
What was wrong with my reasoning?