The asa suction unit constitutes a compact and yet powerful unit for fluid management in hydraulic systems. The asa butterfly flange with SAE and DIN connections allows the combination with an elastic element, namely a rubber compensator, to realize a short compensating connection with the pump port. The suction unit is screwed to the adapter flange, which is welded to the tank. Furthermore, a limit switch (mechanical or inductive) can be added to the standard configuration for monitoring purposes. Thanks to the low installation costs as well as to its compact design that reduces joint sealings, purchasing asa suction units is very cost effective.