Turbo Outlet to Upper Intake Manifold O-ring seal for 6.5L diesel engines equipped with center-mounted GM6 & GM7 Turbos. Made of thick, pliable high quality (oil resistant) rubber. Common applications for this O-ring include: GMC & Chevy Vans and P-series chassis, Grumman Workhorse chassis and Civilian H-1's and Military HMMWV's with the 6.5L turbo diesel engine. This part is now discontinued through AM General & GM. GM # 12456133 AM General # 5745167 NSN# 5331-01-472-8177 Seal turbo compress o-ring, manifold (o-ring)