The GRACO 157705 is a swivel union fitting designed to connect hoses or components with different thread types and sizes. It is constructed from carbon steel and is intended for use in high-pressure fluid handling systems, such as those found in airless spray equipment.

Key Features:

• Union, Swivel
• 1/4 in NPT (male) x 3/8 in NPSM (female)
• Carbon Steel
• Maximum working pressure: 5000–7500 psi (varies by source; most commonly cited as 5000 psi)
• For use with airless spray guns and compatible with NPT (tapered) and NPSM (straight mechanical) threads
• Swivel design for easy installation and alignment
• Durable carbon steel construction for reliability
• Suitable for high-pressure applications

Applications:
Used in airless spray equipment and other high-pressure fluid handling systems where secure, leak-resistant connections between different thread types are required.

Installation Notes:

• Using genuine GRACO parts ensures compatibility, reliability, and optimal performance within GRACO equipment.
• Ensure threads are clean and free of debris before installation
• Use Teflon tape or jointing compound on NPT threads for a pressure-tight seal
• Hand-tighten and then use a wrench for final tightening, being careful not to overtighten
• Check for leaks after installation and during operation