A great shower hose for all pressures. This high quality wide bore, flexible, chrome-plated, stainless steel shower hose includes two rubber washers. Fits into most shower sliders. 9mm internal diameter. 16mm external diameter. Flats on the metal cone at one end for easy tightening. Hex on the other end. Washers 2.5mm thick x 19mm OD x 11mm ID.