An apparatus and a method to prevent undesired objects when communication conduit is disposed therethrough. The system is sealed so that fluids are constrained for movement only within and between the engine, radiator and external tanks through the various hoses. A grating mask is formed on the two lateral flat portions, side walls of the ridge stripe and the stripe mask. A resistive element may be thermally coupled to the PTC device to assist it reaching the predetermined temperature. It is therefore capable of flexibly coping with the sensitivity of the resist used.