Mueller Valves

mueller
Molkerei Alois Muller GmbH & Co. KG (Muller Dairy (U.K.) often called Mullermilch or simply Muller) is a German dairy company, based in Aretsried which is part of the Bavarian municipality of Fischach. It is part of the Unternehmensgruppe Theo Muller, a multinational producer of dairy products.
Muller is a lunar impact crater. It is located in the highlands near the center of the Moon, in the center of the triangle formed by the much larger craters Albategnius, Ptolemaeus, and Hipparchus. To the east lies Halley, while to the northwest is Gylden.
(in  Robert Mueller (American law enforcement official))

valves
(valve) control consisting of a mechanical device for controlling the flow of a fluid
A device for controlling the passage of fluid through a pipe or duct, esp. an automatic device allowing movement in one direction only
A cylindrical mechanism in a brass instrument that, when depressed or turned, admits air into different sections of tubing and so extends the range of available notes
A membranous fold in a hollow organ or tubular structure, such as a blood vessel or the digestive tract, that maintains the flow of the contents in one direction by closing in response to any pressure from reverse flow
(valve) a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it
(valve) device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone