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1/2" FPT x FPT Coupler.
Used for Thermal Hi-limit Snap Switches.
Fits:
8.712-301.0
8.712-206.0
8.753-450.0
8.712-306.0
8.712-311.0
8.712-179.0
8.712-308.0
8.712-298.0
8.712-316.0
This part is listed as fitting the following models: