Schedule 40 and Schedule 80 PVC share the same outside diameter at every nominal size, which means they use the same fittings and the same tools. What separates them is wall thickness — and that one difference decides pressure rating,...

Two screws can look nearly identical in the bin and behave completely differently in the metal. One drills its own hole as it goes; the other needs a hole waiting for it. Getting that wrong is why crews snap points,...