Available with a 25mm or 34mm adaptor which screws to the valve. Please select the adaptor required from the options above. In The Box: 1 x FMDVWO25 or 34 Valve 1 x Adaptor (Aluminium or Stainless Steel) 1 x Uprated Blue Spring 1 x Uprated Red Spring 1 x Forge Sticker.If you wish to tune this product to fit the needs of your engine, please see the spring tuning kit below. Mods4U is a small family run business who have been working within the modified car parts scene for some time. We are a small business and as such there may be occasions when we are unable to fulfil the order due to issue out of our control so please bear with us!