You can count on the HP17 when it comes to resistance and optimum watertightness. The outlets at the top of the tile fulfil their essential function of keeping the roof watertight. They are effective without looking unsightly, as, once the tile is installed, they are invisible. As for the central reinforcement bars on the underside of the tile, they ensure great stability and the reassurance of knowing you have a quality roof that will resist the worst of the weather. With these technical qualities, allied to a choice of 5 colours and stunning good looks, what more could you wish for?