Rainwater Harvesting Fittings for Owner Builders

I have been asked what the best way to connect the gutter to your rainwater tank is.
My response included good design will always include:
1)   A rainwater head
2)   A Leaf Diverter
3)   A First Flush System
4)   A fine mesh inlet strainer.

To help our Owner Builder students identify these components, pleas see the images below

Rainwater Heads

Leaf Diverter - May be integral to Rainwater Head

Rainwater Tank Inlet Strainer