Component Placement Volvo Bus Corporation Component Description Placement Component appearance and associated adapter Symbol explanations 1 Y911 Y912 Y924 1 The illustrations show examples of the appearance of the components See also, 300, Component placement, Description, Design and function The reader is advised that printed copies are uncontrolled. 27 Dosing valve (SCR) 12 – A 6x2 Fig. 9 – A 4x2 Solenoid valve, heater AdBlue tank 5 – A Fig. Solenoid valve oil separator 8 – C Fig.