We recommend servicing your valve every 3 years, or 20,000 miles, whichever comes sooner 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.This item is in the category "Vehicle Parts & Accessories\Car Tuning & Styling\Air Intake & Induction\Dump, Bypass & Blow-Off Valves". The seller is "wg_motorparts" and is located in this country: GB. This item can be shipped worldwide.