Under normal water pressure the water filtration system will immediately visually exhibit {HEAD ~ a substantial leak} if the filter cartridge is coupled to the manifold of the water filtration system in the operative position without the O ring being positioned in {TAIL ~ the large cylindrical cavity} 
Under normal water pressure the water filtration system will immediately visually exhibit { HEAD ~ a substantial leak } if the filter cartridge is coupled to the manifold of the water filtration system in the operative position without the O ring being positioned in { TAIL ~ the large cylindrical cavity }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL