Each submersible transmitter is constructed with a vent tube inside the cable jacket to allow for pressure equalization inside and outside the sensor body. Venting helps reduce inaccuracies from changes in temperature and/or atmospheric pressure. However, this setup also provides a potential for moisture ingress. Attached to the end of the transmitter vent tube, the termination box prevents moisture ingress into the tube and subsequently the transmitter body. As internal moisture may affect the functionality or damage the transmitter, this box is encouraged for any installation with potential humidity or significant temperature changes.