Synapse Engineering Synchronic SB001A Blow Off Valve Greddy Type R/S/RS and HKS Racing Adapter - P/N: SB001.3A Product Model: SYN- SB001.3A SB001 is a universal, pull-type B.O.V. design that eliminates leaking by seating the valve more as boost pressure increases. Each assembly is pressure tested to 100 psi prior to leaving the factory. Interchangeable inlet and discharge flanges allow us to offer various adapter and kits for many popular applications. Synchronic BOV Greddy Type R/S/RS and HKS Racing Adapter.