The Stevens SDX Pressure Sensor is a “Wet-Wet” device. While it is important to keep the SDX cable’s vent tube unobstructed for barometric pressure compensation, neither the pressure transducer nor internal electronics are damaged by condensation or moisture entering the vent tube. It is recommended that each SDX vent tube is protected from water ingress with either a vent tube cap (T-SDX-93030-500) or this desiccant cartridge.