Ad Blue Injectoion Valve Reducing Agents Original Vauxhall Astra K St 55485257. The description of this item has been automatically translated. Unless otherwise stated, what is offered is a used original part, as described in the title above. Opel Astra K Sportstourer (4/5-door / left-hand drive). 1.5 CDTI (F15DVC). Condition / other comments. As can be seen from the pictures, in good used condition! Compare part numbers or ask if in doubt! We will be happy to check whether the spare part is suitable for your vehicle using the vehicle identification number.