Have been using the Flojet "Poop Cannon" for 3 seasons (this being the 4th)... never a problem. Haven't had a 3" sewer hose on board in as many years. (2) 25' black rubber hoses that are used for grey water with a grey water cap...when needed Flojet hooked up to same hoses and empty 32 gal of black in 3 minutes or so... dump at home all the time into a 2" sanitary sewer line ran specifically for this.
Ours is set up with 10ga wire from battery to a trolling motor plug installed at tank outlet.