F3S Self-closing straight-way valve DN 20 for in-wall mounting, for shower facilities. Self-closing functional part, hydraulically c ontrolled, piston-free design, automatic closing, adjustable flow duration. For connection to pre-mixed hot water or cold water. Housing including replaceable valve seat, with interior thread G 3/4, visible parts made of high-polished chrome-plated brass. With rosette, depth adjustability 15 mm.