Patent ID: 8348397

Claim:
A fluid height backpressure device, comprising: a device body of substantially planar configuration and having opposite sides; a closure of substantially planar configuration, the device body and closure being assembled into at least one tower as a single unit of a substantially planar configuration and having a perimeter and first and second chambers within the perimeter, the device body providing one of two opposite walls of the tower, the closure providing the other of the two opposite end walls of the tower, the two end walls of the tower facing toward each other; at least one continuous exterior edge wall formed on and protruding outwardly from one of the opposite sides of the device body and located between the device body and closure so as to define the perimeter of the tower; interior partition walls encompassed by the continuous exterior edge wall, formed on the one side of and protruding outwardly from the device body, and located between the device body and closure so as to define the first and second chambers within the perimeter of the tower, the closure being fixedly attached to outer surfaces on the continuous exterior edge wall and the interior partition walls so as to enclose the first and second chambers of the tower; an inlet formed through the device body to permit flow of fluid into the first chamber; an outlet formed through the device body to permit flow of fluid from the second chamber; and fluid entrance and drip ports between the first and second chambers for establishing backpressure in the second chamber of the tower, the fluid drip port being at a top of the first chamber above an air-fluid interface in the second chamber so fluid can drip downward from the fluid drip port through air before reaching the air-fluid interface.