A: The receiver side of the adapter protrudes about 5/8" inside of the pipe. Well casings should be a min. of 6" dia.
A: Just to update my previous answer it's closer to 11/16" protrusion
A: The pitless adapter is primarily inside the well casing, so the pump does not "pass" the pitless adapter. The point of the pitless adapter is that it goes in and out with the pump at the same time. A "pull pipe" is installed on the top of the pitless adapter. However, your main issue will be installing the pitless adapter in a 4" ID well casing. If this is a new install and you can get the pitless installed prior to burying the casing, it should work. But if the casing is already in the ground, depending how far down you have to reach, it may be difficult to get the adapter in the casing and through the side-cut hole.
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