Super Sequential Blow-off Valve SQV / SQV Sequential Style Turbocharger Turbo Valve, Super Sequential Blow-off Valve1. Dual valve design, sequential system. the HKS super sequential blow off (SSQV)is a dual stage pull type relief valve, which will not leak under any level of boost. 2. This ensures a quick valve response and complete closure idle. 3. Pull type blow off valves will work for any turbocharged vehicle, from stock to highly tuned. 4. The SSQV will operate under any boost pressure setting without leaking. Specification: General Material Plastic, Metal