This replacement O-ring seal is specified for 102mm throttle bodies used with FAST LSXR and LSXRT intake manifolds. It provides the sealing interface between the throttle body and the LSXR/LSXRT 102mm intake manifold flange, intended to prevent air leaks at that junction and maintain a proper throttle-to-manifold seal during installation or service.
FAST O-Ring Seal For 102MM Throttle