Section 153.285 - Valving for cargo pump manifolds(a) When cargo lines serving different tanks enter a pumproom and connect to the same pump: (1) Each cargo line must have a stop valve within the line;(2) The valve must be before the cargo line joins the other lines or pump; and(3) The valve must be within the pumproom.(b) The valve in paragraph (a) of this section is required in addition to any valve required under § 153.283(b) .