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Graco 103605 Gb Coupling Hose

The Graco 103605 GB Coupling Hose securely connects a 5/16" hose to a 1/4" NPS(f) port, ensuring a leak-free, durable connection for various Graco systems.

  • Part Number: 103605 (103-605)
  • Connection: 5/16" hose to 1/4" NPS(f)
  • Application: Airless sprayers, lubrication & fluid systems
  • Material: Metal construction for strength and durability
  • Category: Hose Fittings & Connectors

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Hose Coupling Specs & Compatibility

Compatible Machines

General-use hose coupling — verify hose size and thread before ordering
  • Graco systems using 5/16" hose transitioning to 1/4" NPS(f) thread
  • Common across many Graco airless paint sprayer hose assemblies (model-specific confirmation required)
  • Suitable for Graco fluid transfer, lubrication, and hose-reel applications with matching sizes

Product Overview

The Graco 103605 GB Coupling Hose is a compact, reliable hose coupling designed to connect a 5/16" hose to a 1/4" NPS(f) threaded port. Using genuine Graco fittings helps maintain system integrity, leak resistance, and performance across spraying and fluid-handling setups.

Key Features

  • Genuine Graco coupling for durable, leak-resistant connections
  • 5/16" hose side to 1/4" NPS(f) thread interface
  • Compact profile for tight installations and quick service swaps
  • Compatible with many Graco airless and fluid-handling systems (size match required)

Technical Specifications

Part Number 103605 (may appear as 103-605)
Type Hose Coupling / Hose Fitting
Hose Side 5/16" hose (typical)
Thread Side 1/4" NPS(f) – female
Material Metal construction (engineered for fluid systems)
Category Graco Hose Fittings & Connectors
Cross-Reference Bedford Precision 12-301 (for reference)

Notes on Fitment

  • Because this is a general-purpose hose coupling, specific model lists are not always published.
  • Confirm your machine’s hose I.D. and receiving thread: 5/16" hose → 1/4" NPS(f).
  • Check your unit’s parts manual or exploded view to verify the exact coupling part number.

Installation Tips

  • Depressurize the system completely before service.
  • Inspect hose end and port threads; replace worn components.
  • Tighten to manufacturer-recommended torque; do not overtighten.
  • Pressure-test the system and check for leaks after installation.

Frequently Asked Questions

It fits machines whose hose interface is 5/16" hose to 1/4" NPS(f). Check your sprayer’s parts list or hose kit spec to confirm the exact coupling part number.

The female side is 1/4" NPS(f) (National Pipe Straight, female). Verify your port is NPS and not NPT before ordering.

Yes, 103605 is a genuine Graco coupling. A common cross-reference is Bedford Precision 12-301 for comparison.

Depressurize, inspect threads, seat the coupling squarely, tighten to spec, and perform a leak check under working pressure. Replace damaged hoses or ports before reuse.

Choose a coupling that matches your hose I.D. and port thread. Graco offers a range of hose fittings & connectors for other size transitions.

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