633,092. Tyre valves. MANUFACTURE DE CAOUTCHOUC MICHELIN. Jan. 23, 1947, No. 2193. Convention date, Feb. 12, 1943. [Class 135] A tyre valve housing comprises a fixed foot 2 bonded in a rubber base 1, and an angularlyadjustable valve stem 6 screwed on to the foot. The stem has a conical face 7 which makes an airtight joint with a seat on the base 1 and is held in position by a nut and washer.