<VV> Odd contraption

[Grant Young]

I have recently obtained a kit called a Flood Check. It is composed of double threaded fittings that screw into both sides of the fuel pump and these fittings have nipples with a check ball in them that are connected with a vinyl tube. As far as I can determine, that allows fuel to move from one side of pump to the other as needed to help prevent flooding. It is very old, but NOS. Wondering anyone else has seen or used one and if it works?
Thanks,
Grant