Synapse Engineering Synchronic SB001A Blow Off Valve Aluminum Adapter - P/N: SB001.1A Product Model: SYN- SB001.1A 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 billet Aluminum weld adapter flange