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Graco 16A990 Coupling 1/4-Inch Hose ID x 3/8-Inch NSPM

The Graco 16A990 Coupling connects 1/4 inch hose ID lines to equipment using a 3/8 inch NPSM thread, providing a secure and leak-resistant link for finishing systems.

  • 1/4 inch Hose ID compatibility
  • 3/8 inch NPSM threaded connection
  • Genuine Graco replacement part
  • Ideal for finishing and low-pressure fluid systems

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Graco 16A990 Coupling – 1/4 Inch Hose ID × 3/8 Inch NPSM

Compatible Machines

This Graco 16A990 Coupling is used in finishing and fluid handling systems that require a 1/4 inch hose ID connection with a 3/8 inch NPSM thread. It is not limited to a single sprayer model; compatibility depends on hose size and thread type.

  • Graco finishing sprayers using 1/4 inch fluid hoses
  • Systems equipped with 3/8 inch NPSM threaded hose connections
  • Low-pressure finishing and coating setups rated for 500 psi class hose fittings
  • General Graco hose assemblies designed for 1/4 inch ID lines

Product Details

The 16A990 Coupling is a genuine Graco fitting used to connect 1/4 inch inside-diameter hoses to equipment or hose lines requiring a 3/8 inch NPSM straight mechanical thread. It offers a secure and leak-resistant connection for finishing applications.

Part Number 16A990
Hose Compatibility 1/4 inch Hose ID
Thread Type 3/8 inch NPSM
Application Finishing, low-pressure spray and fluid handling systems
Pressure Class Approx. 500 psi (finishing hose rating)

Frequently Asked Questions

It connects directly to a hose with a 1/4 inch inside diameter. Using any other hose size will prevent proper sealing and flow.

It fits any system that uses a 1/4 inch hose ID with a 3/8 inch NPSM thread. If your sprayer uses these specifications, the coupling will match. Always confirm your hose ID and thread type before ordering.

This coupling appears in Graco's finishing accessories, typically rated around 500 psi. It is not designed for the higher pressures commonly used in large airless sprayers. Verify your system pressure before use.

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