Half the houses in Millbrook are older than the big-box stores' current catalog — so we kept ordering the fittings and fixtures they stopped carrying, because the town kept needing them. If a part looks obsolete, it's worth asking here before assuming you'll have to special-order it.
Real troubleshooting at the counter, not a self-checkout: describe the leak or the dead outlet, and you'll walk out with the right part the first time, not the third.