PURPOSE: A water temperature controller is provided to absorb vibration of a cylinder head by being assembled from plural bodies. CONSTITUTION: A water temperature controller comprises a first body(10), a second body(20) and a seal pipe(30). The first body includes a first coupling part(12). The second body includes a second coupling part(22). The seal pipe is installed between the first and the second coupling part in order to prevent the leakage of cooling water. The first coupling part is inserted to longitudinally move relative in the second coupling part, thereby absorbing vibration.
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