>>105637598Have they? Where? Maybe if they were plumbers.
Diameter of a pipe really isn't the same thing as resistance. Resistance per meter maybe, but I don't think that's what you meant. Water will prefer to go down a larger pipe then a smaller pipe, but that isn't because diameter is like resistance, but rather because the constriction acts like a capacitor. But this is all far above where OP stands, I expect. Water flow is simple enough, but water pressure is totally above most people.