The GRACO 903508 is a manual back pressure regulator designed for low pressure, corrosion-resistant applications. It features stainless steel wetted materials for compatibility with catalyst and waterborne materials, and is intended to maintain system pressure regardless of flow demand within GRACO fluid circulation systems.

Key Features:

• Back Pressure Regulator
• 903508 / 3/8 (m) x 3/8 (f)
• Stainless steel wetted materials, hardened stainless steel seat, PTFE/Elastomer hybrid diaphragm
• 15 GPM (56.7 lpm)
• 180 Max psi
• Compatible with catalyst and waterborne materials
• Large orifice accommodates high volume flow rates
• Hardened stainless steel seat ensures low wear and long life
• PTFE/Elastomer hybrid diaphragm withstands wear while maintaining accurate responsiveness
• Manual operation with gauge for pressure monitoring

Applications:
Used in fluid circulation systems to maintain consistent system pressure, especially in finishing processes where precise fluid control is required. Suitable for use with catalyst and waterborne materials in industrial and manufacturing environments.

Installation Notes:

• Using genuine GRACO parts ensures compatibility, reliability, and optimal performance within GRACO equipment.
• Ensure proper thread engagement and sealing when connecting to 3/8-inch NPT ports
• Install in a location accessible for manual adjustment and pressure monitoring
• Regularly inspect diaphragm and seat for wear and replace as needed to maintain performance
• Follow manufacturer guidelines for system pressure and flow rate limits