This prevents the diaphragm from sealing. Our alternative is a fully engineered solution offering both significantly improved reliability. The Forge valve is piston based, there is no diaphragm to fail, and of all aluminium billet construction, it replaces the original unit with a pressure/vacuum operated piston valve that still also retains the desirable OEM ECU control, over valve actuation.In The Box: 1 x FMDV23R Valve 1 x 2000mm of 4mm Vacuum Tube 1 x 50mm of 10mm Vacuum Tube 1 x 3 port Solenoid and fixings 13 x Cable Ties 1 x Uprated Red Spring 1 x 10-6-10 T Piece 1 x Forge USB Instructions 1 x Forge Keyring and Sticker If you wish to tune this product to fit the needs of your engine, please see the spring tuning kit below. 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.