The 20″ extender cable is intended to give some separation between the light and power switch. A convenient distance for the user to reach for turning the light On and Off.
The 40″ extender cable is to add a little more length if the 20″ extender and 59″ length from the power supply is just not enough.
These are strictly for Leak Lights. The Digital Leak Tester uses a different size plug.
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