Various
2", drain valve, the same drain valve that comes as original equipment on many water heaters, will fit all makes, select the valve that is long enough to clear the insulation between the jacket & the tank.
Reliance Screw-In Water Heater Element
Homewerks Worldwide Braided Stainless-Steel Water Heater Connector
Reliance 2000W Screw-In High Watt Density Water Heater Element
Water Heater Thermostat, Single, Universal
T & P Valve, 2.5-In.