The WCS Tube Trap comprises a steel cylindrical tube painted a brownish green (A)
A pressed metal treadle plate is located inside the tube mid-distance from each end. The treadle extends out through a circular hole in the wall of the tube to a pivot point on a trigger assembly (B)
Inside the tube, opposite the trigger assembly are two clamping bars which are not present in non-UK approved traps.
On the outside of the tube,opposite the trigger assembly, a rectangular U-shaped impact bar (C), energised by a double torsion spring, pivots on a steel rod. The impact bar rotates around the steel rod within two slots through the wall of the tube.