What is a GM Fuel Rail Adapter -4 AN Thread?

GlowShift’s -4 AN Fuel Rail Adapter is designed to replace the Schrader valve on your fuel rail which allows you to easily install your fuel pressure sender. Easily fits into any GM 5.3L & 6.0L Fuel Rail for quick and easy monitoring of aftermarket Fuel Pressure Sensors. Simply remove the Schrader valve and install the adapter for quick and easy installation.

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