arm assembly 18 is mounted to the l shaped member 20 by two brackets 30 and 32 the two brackets 30 and 32 are formed with apertures 31 and 33 which slidingly fit about the member 20 each bracket 30 and 32 also includes a slot 34 and 36 respectively these slots 34 and 36 fit about the rod 16 tightening screws 38 and 40 are threadably fit through the brackets 30 and 32 to engage and tighten down onto the rod 16 as will be described more fully the reservoir assembly 10 includes two separate reservoirs cardiotomy reservoir and venous reservoir seen generally at 42 and 44 respectively the cardiotomy reservoir 42 is formed to fit atop the venous reservoir 44 it should be noted that the two reservoirs 42 and 44 may be formed as a single integral unit or as two completely separate devices cardiotomy reservoir 42 includes multiple inlet ports 46 these ports 46 direct blood through a filter assembly seen generally at 48 blood passing through the filter assembly 48 will fill the lower portion of the reservoir 42 seen generally at 52 which is formed with a well shaped region 100 as seen in fig1 this portion of the reservoir 42 includes a gradient scale 54 the gradient scale 54 allows the perfusionist to determine the quantity of blood in the reservoir 42 blood exits this reservoir 42 through outlet port 50 venous reservoir 44 includes a single inlet port 56 and a single outlet port 58 as will be described.