Red Bull still had the F-duct fitted to its RB6 on Saturday morning in Valencia.

Red Bull still had the F-duct fitted to its RB6 on Saturday morning in Valencia.

According to the BBC, the Milton Keynes based team has confirmed the downforce-stalling device will also remain on the Renault-powered car for qualifying and the race.

Sebastian Vettel topped the final 60 minutes of practice at the sunny street circuit, with his teammate Mark Webber third, split by Renault's Robert Kubica.

The two Force Indias were fourth and seventh, with the team having ironed out the problems with its F-duct version.

"(It) is working very well now and it makes a real difference," said German Adrian Sutil.

Ferrari's Fernando Alonso was fifth, while the McLarens were just ninth and tenth, and Mercedes' Nico Rosberg 11th.

"There are a lot of quick cars out there," said Jenson Button. "The Ferraris look very fast, so do the Red Bulls, Renaults and Mercedes."

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Red Bull keeps F-duct as Vettel heads final practice