Copper Tubes

     Tubes, which you could use to aim and maneuver bursts from geysers. using copper funnels, which would be crafted using copper in the shape of a hopper, though missing the chest. This could pick up items and blasts of air from geysers. You could then make a network of Copper Tubes that would direct the geyser blast/items anywhere you pleased. With a Copper Wrench you could change the orientation of the tube, from straight to intersecting.

     This would allow people to make blasts of air to push mobs around, and it would also give an alternative to Hoppers, which are much more expensive.