GP6504-20-20-04FP Tompkins JIC Swivel Gauge Port, -04 Female Pipe Port

Tompkins configures GP6504-20-20-04FP for a JIC swivel primary connection path, then adds pressure-gauge access through a dedicated third port. GP6504 is the swivel option in this group, using a male JIC connection opposite a female JIC swivel.

The matching 20/20 nominal sizing puts this model toward the larger half of the family. The gauge takeoff is threaded 1/4-18 female pipe. That thread should be checked separately from the two primary fitting sizes, because the SAE O-ring version of the family uses a different third-port connection.

If the same 20/20 primary sizes are needed with the SAE O-ring gauge-port style, the corresponding alternate part is GP6504-20-20-04FB. For replacement selection, the safest match is the complete connection set—not just the series or overall appearance of the fitting.