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M14 x 1.5 wire connection on the car. (Mini filler often behind petrol flap)
If you measure the thread size (inside diameter / hole diameter) with a caliper on your car, you measure it about 2 mm smaller, because you cannot measure the height of the thread twice.
So with this type of screw thread you will measure approximately an inner diameter of 12 mm.
Another adapter can also be screwed onto this adapter with a W21.8 thread on the pump side.