This twin Piston Blow off Valve is specifically designed for those that wish to install the valve by welding direct to a hard pipe installation, intake manifold, intercooler or similar. 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 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.