Flopper is an easy to use fluid transfer tool similar to hoppers. Just place it and fill it with the fluid of your choice. It can hold 5,000 units of water or lava.

You can use them to store a large amount of fluid or place them to drain water for easy collection.

They can also be used in conjunction with a mod that has tanks. The tanks can store additional fluid or transfer fluid from them.

And they can also be toggled with redstone. The fluid flows naturally without it but when redstone is activated the flow will cut off.

This mod also requires an additional API found here.