GP6504-08-08-04FB Tompkins JIC Swivel Gauge Port, -04 SAE O-Ring Port

On GP6504-08-08-04FB, Tompkins combines the JIC swivel fitting path with a third connection specifically for the pressure gauge.

The GP6504 family adds a female JIC swivel to the primary connection path, paired with a male JIC connection. The FB designation matters here: this model's gauge takeoff is 7/16-20 female O-ring, not the female pipe style offered elsewhere in the same family.

The 08/08 pairing sits in the middle of the available nominal-size range, making the part number itself important when comparing adjacent sizes.

Review the nominal sizes and gauge-port thread together before treating another GP6504 part number as interchangeable.