Graco 157705 Union 1/4 in x 3/8 in

Ensure reliable, leak-free connections in your airless spray system with the Graco 157705 Union 1/4 in x 3/8 in. Compact and durable, it adapts different hose sizes seamlessly.

High-pressure rated up to 5000 psi
Compact design for tight-space installation
Carbon steel construction for long-lasting durability
Compatible with Graco Ultra 395/495/595, ST Max II, LineLazer, and ProContractor series
Supports solvent-based and waterborne coatings

$15.5

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Description

Graco 157705 Union Fitting 1/4 in x 3/8 in Overview

The Graco 157705 Union is a high-pressure fitting designed to connect a 1/4-inch male NPT line to a 3/8-inch female NPSM port. Ideal for airless spray systems, it provides leak-free performance and smooth fluid flow for professional coating applications.

Compatible Machines

Machine Model	Type / Series
Graco Ultra 395	Airless Sprayer
Graco Ultra 495	Airless Sprayer
Graco Ultra 595	Airless Sprayer
Graco ST Max II	Airless Sprayer
Graco LineLazer	Contractor Sprayer
Graco ProContractor Series	Airless / Contractor Sprayer

Key Features

1/4 in x 3/8 in union fitting for flexible hose connections
High-pressure rated up to 5000 psi
Carbon steel construction for durability
Compact design for tight-space installation
Leak-free performance for professional spraying applications

Installation & Maintenance

Ensure the union is properly threaded and tightened according to torque specifications. Use compatible thread sealants if required. Regularly inspect O-rings and connection points to maintain long-term reliability.

Frequently Asked Questions

Compatible with solvent-based and waterborne coatings, sealants, and other high-viscosity fluids. Always verify chemical compatibility with the union materials.

The fitting is rated for pressures up to 5000 psi, suitable for professional airless spray systems.

Yes, provided that the system’s thread sizes match 1/4-inch male NPT to 3/8-inch female NPSM. Always confirm compatibility before installation.