Multiway wave

Closure element flow, comprising: - a valve body (2) having an internal cavity (3) and a plurality of accesses (4, 5, 6) communicating with said inner cavity (3) to allow a flow fluid; and - a selector (7) associated with the valve body (2) and displaceable relative to the latter in a predetermined operative position number, the said selector (7) being active in said inner cavity (3) to form, as a movements result of said operating positions, predetermined paths in which fluid flow is permitted and / or closing between said ports (4, 5, 6); characterized by also comprising an auxiliary element (8) associated with the valve body (2) and made in the form of an independent body, said auxiliary element (8) positioning means (9) being provided to allow an operator to determine when it has reached a selector of said predetermined operating positions.