No second hose needed. We use the Sanicon system and love it. Easy peasy to dump tanks, and fast too.
2018 Eagle HT 26.5 RLDS. 2009 F150 Supercab UNICORN, 5.4L ,3.73, HD and Max Tow Packages, Timbrens, Bilstein shocks. Andersen 20K hitch. TST 507RV TPMS. Hydro Life HL-200. 16" Goodyear Endurance. Progressive EMS-LCHW50.
Best friend wife, Di, and dog Cooper. RETIRED 6/30/16. WOOHOO!