I would like to ask whether there is a standard size of the outer diameter of the solar water tank, generally large
Most of them are now 450460470 of the water tank is 480 and 500, Emperor 47*1500 is generally 420
Solar thermal insulation tank 58*1800 is generally between 450 mm -500 mm
Diameter of about 400 mm ~450 mm, there is no uniform standard
