• This adaptor along with 1- H1845G Valve Core (thread size 12-36) can be used to make your required adaptor for engine not listed above. Remove internal mechanism from an old injector or glow plug from that engine, drill and tap to accept the quick coupler and valve core. For Applications not Listed Above H1845S - 1/8" N.P.T. Male Quick Coupler This adaptor along with 1- H1845G Valve Core (thread size 12-36) can be used to make your required adaptor for engine not listed above. Remove internal mechanism from an old injector or glow plug from that engine, drill and tap to accept the quick coupler and valve core.