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Tesla must sell them at a very low mark-up to support the electrification of cars because the Tesla HPWC is the best value of all the EVSE I've seen from other suppliers.
Correct.
TWC (Tesla Wall Connector) replaced the old HPWC (High Power Wall Connector) a couple of years (?) ago. TWC is the one with the integrated holder for the charging plug on the side. And the TWC can load balance between 4 units connected together.