S-jet fuel inlet valve Stromberg. The Genuine Stromberg twin-ball S-jet is the ‘next generation’ needle and seat. It’s designed to eject dirt particles and improve high speed running and, unlike many a so-called viton-tipped needle valve, it won’t stick or melt in today’s corrosive new gas formulas. Comes with a new fibre washer. Fits Stromberg 97, 48, 81 and 40. Sold each.