A double diaphragm pump having a spool valve. The spool valve includes a housing
that has a first end, a second end, and at least one housing aperture defined therethrough
from the first end to the second end of the housing. The spool valve also includes
end plates positioned at the first and second ends of the housing. The end plates
include at least one plate aperture defined therein that is aligned with the housing
aperture. The spool valve further includes at least one stiffening and retaining
rod inserted through the plate apertures and the housing.
