This is a piston design recirculation valve that is a direct replacement for the original fitment. This valve gives greater longevity than the diaphragm (OEM) valves but also benefits from its ability to be fitted with different springs when the boost pressure has been increasded or the engine has been modified. In The Box: 1 x FMDVCS14R Valve 1 x Uprated Yellow Spring 1 x Forge Sticker All Forge Motorsport products come with a limited lifetime warranty. All warranty claims must be accompanied by the original proof of purchase to enable us to help you. Failure to supply this proof will result in your claim or enquiry being denied.