A reductant system for an aftertreatment system of an internal combustion engine is disclosed. The reductant system includes at least one reductant feed line and a reductant system component such as a dosing module. The feed line is connected to the dosing module with a fluid connector. The fluid connector includes a body made from a first material that has a low heat conductivity and an insert made from a second material that has a greater heat conductivity than that of the first material. The insert extends from the body of the fluid connector into a storage chamber of the dosing module, and conducts heat from heated reductant in the feed line to the reductant stored in the storage chamber.