This is the best tool to use when installing or removing the Monark hand primer pump. PLEASE NOTE. This is 19mm and will NOT work on the Bosch hand primer pump or other style pumps (most others are 17 mm). Watch the video below for a full explanation on how to remove these other style old worn out primer pumps without a crowfoot wrench.
This wrench is best used with a locking extension (although not required) but as you can see in the picture below, you can get into some real tight places with this crowfoot high quality USA made wrench.