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