Adapter, -4 AN Female » 1/8" FPT, BLACK
FGAF-418 - Adapter (Gauge), -4 AN Female to 1/8" FPT, Black ...
This adapter fitting is commonly used to mount a fuel pressure gauge onto a fuel pressure tests port found on many late-model fuel injected cars.
Common on GM. Ford, Chrysler etc.
Removal of the Schrader valve is required with a inexpensive tool also used for tire valve stems.
Always use Teflon tape to seal the pipe threads. Do not over-tighten these fittings.