Patent ID: 8256880

Claim:
A fluid height backpressure device, comprising: a device body of substantially planar configuration and having opposite sides; a pair of closures of substantially planar configuration, each closure positioned on one of the opposite sides of the device body, the closures and device body 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 an intermediate wall of the tower, the closures providing opposite end walls of the tower facing toward each other; continuous exterior edge walls formed on and protruding outwardly from the opposite sides of the device body and located between the device body and closures so as to define the perimeter of the tower; interior partition walls encompassed by the continuous exterior edge walls, formed on and protruding outwardly from the opposite sides of the device body, and located between the device body and closures so as to define the first and second chambers within the perimeter of the tower, the closures being fixedly attached to outer surfaces on the continuous exterior edge walls 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 a fluid drip port 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.