do you need to have a purpose label for flow velocity?

Flow velocity purpose label?

I think he means a description label for the flow meter in his loop. I don't have them for mine.

I don't have them either, if that's what he's asking.

don't have it also but you need to know and be able to explain to the surveyors what your flow velocity is on your loop. they might ask you to calculate it for them-keep a flow velocity chart nearby.