Medical device, which can be connected to a water line for the supply of water or treated water to the medical device, which contains an adapter, which has a first feeding section (4) with a coupling piece (1 ) at the end, for connection with the water line (3), with a rear pressure sensor (20) and two rear shut-off valves (5, 6), arranged in series, and two second feed sections (8 , 9) which, by means of a branching piece (7) branch out from the first feed section (4), one of the second feed sections (8) being connected by a connection (10), with the conduit of permeate inlet (11) of the medical device, which flows into a feed container (12), and the other of the second feed sections (9) being connected, via a connection (13) and a shut-off valve ( 16), with another liquid conduit (15) of the medical device, in which a shut-off valve (17) is connected and which also flows into the feed container (12), the other liquid conduit (15) being able to be traversed during a disinfection process by a disinfection liquid and the valves being of closing (16 and 17) at the same time alternately switchable, so that the disinfection liquid circulates, alternately, through the other liquid conduit (15), in the feed container (12) and, a through the second feed sections (8, 9) and the permeate inlet duct (11) in the feed container (12).Aparato médico, el cual, se puede conectar a un conducto de agua para el suministro de agua o de agua tratada al aparato médico, que contiene un adaptador, el cual presenta una primera sección de alimentación (4) con una pieza de acoplamiento (1) por el extremo, para la conexión con el conducto de agua (3), con un sensor de presión (20) posterior y dos válvulas de cierre (5, 6) posteriores, dispuestas en serie, y dos segundas secciones de alimentación (8, 9) las cuales, mediante una pieza de ramificación (7) se ramifican a partir de la primera sección de alimentación (4), estando conectada una de las segundas secciones de alimentación (8) mediante u
