Unleaded blend composition having a Motor Octane Number of at least 80 having less than 42% of aromatic compounds, and at least 2% by volume of the total composition of component, which is a substantially aliphatic hydrocarbon refinery stream of MON value of at least 85. An opaque sleeve or the like is provided about the passage to conceal the passage and any wiring or other element installed therein. The apertures are in fluid communication with a plurality of ducts and passageways which are configured to provide various modes of operation depending upon whether, for the particular surgical conditions, it is desired to mix venous and cardiotomy blood, or to isolate those blood pools from each other. The advertised service can be employed or accessed during the boxing match or immediately after the advertisement is seen by the consumer.