(B) A protective filter when the vent is in an area that is not protected from windblown dirt and debris. 5-302.15 Inlet and Outlet, Sloped to Drain. (A) A water tank and its inlet and outlet shall be sloped to drain. (B) A water tank inlet shall be positioned so that it is protected from contaminants such as waste discharge, road dust, oil, or grease. 5-302.16 Hose, Construction and Identificatio