- Thread is a little unusual on this tap, just 3/8 inch male BSP (most other water fittings are 1/2 inch) - When folded down, this tap requires 75mm above the bench top for the handle. The spout needs 175mm from the centreline of the mounting hole it folds down into - The tap is suitable for mains pressure. The flange that sits above the sink is approx 28mm diameter