We have a winner of the last contest - Bob Dornbos (Jason's Dad) indicated correctly that the item pictured was a screw type pump.  The advantage of using this type pump instead of a typical impeller type pump is that you get the same amount of volume pumped with one rotation of the motor regardless of the speed of the motor.  This system works well for solar applications.

Here is another contest question:

The group will be travelling by bus from PP back to Siem Reap on Sunday.   The trip will take about 6 hours. How many kilometers is this distance? 

Thank you for your continued prayers. 

Regards,

Leonard De Rooy