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Your drop pipe down the well can be galvanized or sch 40 or 80 PVC or PE (polyethylene) pipe; black or blue. The galvanized will be threaded 21' and PVC usually 20' threaded sections. I've even seen soldered copper once or twice.
There should not be a check valve, swing or spring loaded (which is the usual type) anywhere but in or on the outlet of a submersible pump. Many timesp eople add one at the tank because they have a leak in the drop pipe or the pump's check valve. having one there hides leaks between it and the one in/on the submersible pump, which is not good.
Unless you know how deep the pump is in the well, or how deep the well is to get an idea of pump depth, pulling the pump could be quite an adventure, especially with 20-21' sections of pipe. You have to prevent things from falling down the well as you stop pulling it to unscrew the sections.
You need to fix the leak and stop the pump from cycling or you'll burn up the motor; it's very hard on motors. If you have a broken fitting you can lose the pump down the well if the fitting breaks off.
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