t = peripheral.wrap(tankSide)

        if t ~= nil then

        value = 0  max = 0
        ti = t.getTankInfo(tankSide)

        if isBarrel then
            for i,j in pairs(ti) do
                for name,data in pairs(j) do
                    if name=="capacity" then
                        max = data
                    elseif name=="amount"
                        then value = data
                    end
                end
            end
        end

        s = "Barrel: "..value.."/"..max..