An unloader (1) of this invention receives a fluent material (e.g., animal fluent material) from a source (BFT) and delivers the fluent material into a conveyor (1) which is in fluent material receiving relation with the unloader. The unloader comprises an unloader body or housing (35) adapted to receive the fluent material from the source of the fluent material. The body has an inlet (53) and an outlet (55) for receiving a conveyor. The conveyor enters the unloader via the inlet, picks up the fluent material within the unloader, and conveys it therefrom via the conveyor outlet. A regulator tube (59) at least in part surrounds the conveyor as the latter passes through the unloader body. The regulator tube (59) has a regulator opening (61) therein. The regulating tube is rotatable with respect to the unloader body between a closed position (as shown in Fig. 5A) in which the regulator opening is closed block the flow of fluent material from within the unloader body through the regulatory opening to the conveyor and an open position (as shown in Figs. 5B and 5C) in which the regulator opening receives the fluent material from within the unloader body and permits the fluent material to be delivered to the conveyor.