local valve = peripheral.wrap("left")
while true do

local tableInfo = valve.getTanks("unknown")
  for k, v in pairs(tableInfo) do
    for x, y in pairs(v) do
      if x == "amount" then
        if (y == 720000) then
          redstone.setOutput("right", false)
        elseif (y < 720000) then
          redstone.setOutput("right", true)
        end
      end
    end
  end
  os.sleep(10)
end