GFB, SV50 High Flow Blow off valve HEATING COOLING Fits: 9 3 (06 09) V6 B284 Cobra head Fits: 9 3 (06 09) V6 B284 (Not XWD) Bend: 60 degree Inner diameter 1 (mm): 63 mm Inner diameter 2 (mm): 89 mm Inner diameter 1 (inch): 2 1 2 inch Inner diameter 2 (inch): 3 1 2 inch Leg length (see picture): 125 mm Color: Black Wall thickness: 6 mm Temperature range: 40 to +180 degreeC Outer diameter 1: 75 mm Outer diameter 2: 101 mm Reinforcement: 5 layers Material: High quality silicone rubber polyester fabric The one piece brass piston does not use a diaphragm Competitors’ one piece designs rely on bending the clamp material to open up the clamp