Anatomy of a WurliTzer Theatre Pipe Organ
This assembly is part of the control system for a Tremulant.
It mounts on the front of the trem. The Magnet/Valve Box mounts at the top of this assembly and gets
its air supply through the round hole at the top/right. The Valve controls the air through the oval
hole which connects, via a channel running down the left side, to the Control Pneumatic.