Pitless wells are constructed with the casing extending above ground surface, but the pump discharge pipe is installed below ground surface using a pitless adaptor. A pitless adaptor is a relatively new introduction into well construction and eliminates the need for pit wells and the hazards they can introduce.
Diagram above: Pitless adapter. Source: FDA
Pitless adaptors are designed to provide a water-tight seal and frost-free environment for your well water to reach your house, and a secure location to attach pumping mechanisms. Below you will see an example of pitless adaptor in well.
In this video, you can see a pitless adaptor, the pump discharge pipe connects to the metal adaptor on the right side of the video.