FORGE Atmospheric Valve. Forge Motorsport atmospheric valve for the Honda Civic Type R 2015. This valve and kit gives the customer the choice of installing it in combination with the recirculating OEM valve or on its own utilizing the supplied blanking plate. Developed and machined by Forge it features a robust twin piston design that allows for tuning with interchangeable springs. Suitable for all 2015+ Honda Civic Type R.