Version 21 behaves like version 20 with option codes and all the same features of 20 with Laserminder. You need to know your option code numbers, but no call needed to
PDQ. You just need the upgraded stainless collar and impact shark fin for the impact Reset like version 20. I would also change the impact nylon collar. The nylon swells over the years. You dont need to purchase the kit. I had Alvin fix the temp probe issue,
hamilton goldline pulse and an issue where car stuck in bay with blocked eye would not turn the weep back on, the machine would freeze up. He called it version 21. I have been running this program since 2020. Apparently a long bay with standalone dryer, needs a floor loop for this version to work properly.