The EPS-30V-C is a concrete pressure cell designed to be installed in concrete. This sensor is similar to the EPS-30V-S cell, except having a 600 mm long pinch tube. The purpose of the pinch tube comes when the concrete is cured.
 
To ensure proper contact between the pressure pad and the surrounding concrete, the pinch tube is squeezed to push the fluid into the pressure pad to expand/inflate it.