An apparatus for notifying a user which gas tank to connect to an enclosed chamber such as an incubator. The housing has at least one laterally extending edge portion and a connecting structure extending along at least a portion of the length of the edge portion with a wire passageway passing through the connecting structure. It may thus be possible to do without a coupling gear unit in the electric motor. A sleeve is formed on the second flexible strip. A benzindene prostaglandin known as UT-15 has unexpectedly superior results when administered by inhalation compared to parenterally administered UT-15 in sheep with induced pulmonary hypertension. An MxV2O5 crystal is selectively precipitated in vanadium-based glass, wherein M is one metal element selected from the group consisting of iron, arsenic, antimony, bismuth, tungsten, molybdenum, manganese, nickel, copper, silver, an alkali metal and an alkaline earth metal, and 0<x<1.