Hardware Made Easy!
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.
Nibco Adapter C x M - Wrot
Camco T&P Valve 3/4" w/4" Probe Coated, 150psi (E/F/S)
Telemecanique Sensors Pumptrol Actuated Pressure Switch 20 - 40 PSI
Eastman 1/2 in. OD Epoxy-Coated Gas Connector - FIP x MIP
Elkhart Female Reducing Adapter C x F