IWG75 Diaphragm ReplacementIWG75 Diaphragm Replacement The IWG75 Diaphragm Replacement is a genuine Turbosmart performance part designed for reliable operation, precise fitment and proven results on street and track builds. Turbosmart offers a diaphragm replacement for the IWG75 range of actuators. This single port diaphragm is an ideal solution to replace worn out or damaged parts and to ensure the proper functioning of your turbos with Turbosmart's reliable quality products.