Hi Buccanneer,

Yes this water pump design uses two check balls (Valves) Upper and lower
The hole size under the ball in the upper check valve is close to a #14 drill
Remove your water line and you will see the upper check valve if you have
Not done so already.
The upper check valve closes (seats in the closed postion same as the lower)
In other words the upper is the same design minus the intake holes. The cross pin is facing up.
See Pics below.
The upper check valve has been error proofed at the factory with fine threads at top and
course threads on the bottom. both check valves are closed (Shut off) in the down position.
I wonder who gets credit for error proofing this upper check valve?
Was it Thornwald Hansen president of Thor or
Elmer "Carl" Kiekhaefer?
Yes I think they did not use a screen for two reasons!
1) cheaper to manufacture (less parts & labor to install)
2) less prone to clogging and easier to clean if clogged with mud debris etc..

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