Nibal,
I would think that option would work, or Custom POC might even be a better choice. The difference between these two is going to be how you determine your flow. It sounds like you are given a certain size of pipe to connect to, which if you choose the POC option, it would generate your flow automatically based on the connection size you picked. If you know exactly how much flow you will be generating from the tank, you might want to pick the custom POC which would allow you to set that flow manually. So again, either would work, just think of the flow.