As for the head, I don't have a "Y" valve on mine. If I did, it would be a PITA to reach it. Hopefully, you have a valve. How my tank is setup, the suction discharge line goes down to a "Y" connector (your valve should replace that connector if you have one). One end of the "Y" valve goes to the tank, and the other end goes out to the macerator pump. I did find that if you don't have the suction cap closed tight that the macerator pump will not work well at all (for future reference).