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The vented loop for the head should go between the pumps outlet and the back of the toilet bowl. Do not install it on the suction/inlet side of the pump as this will cause the system to just suck air in through the vented loop. Most heads come with a short pre-made hose that goes from the pumps outlet around the back of the bowl to inject water into the bowl for flushing. Remove this hose and insert a vented loop in its place..Thanks sailingdog, appreciate the fast reply. Right now there is a 3/4 inch hose that brings the water into the toilet. Is this the line that should receive the vented loop before the toilet?...or are you referring to the line from the toilet to the tank??