Graco 903958 Regulator, Mastic
Graco 903958 Regulator, Mastic is an OEM high-pressure fluid regulator designed to maintain consistent pressure when dispensing mastics, sealants, adhesives, and other high-viscosity materials.
- OEM Graco Part: 903958
- Maximum working pressure: 5,000 psi (344 bar)
- Pressure range: 1,000–4,500 psi
- Handles materials up to 80,000 cP viscosity
- 3/4 in. NPT inlet, outlet, and gauge port
- Compatible with Graco mastic, sealant, adhesive, and industrial dispensing systems
Compatible Machines
The Graco 903958 Regulator, Mastic is a system component rather than a model-specific replacement part. It is commonly used with the following Graco equipment and applications:
- Graco high-pressure mastic dispensing systems
- Graco sealant dispensing systems
- Graco adhesive dispensing systems
- Graco extruder gun systems
- Graco multiple spray gun/header systems for high-viscosity materials
- Custom Graco industrial fluid handling systems using a 3/4 in. NPT regulator connection
Product Overview
The Graco 903958 Regulator, Mastic is an OEM high-pressure fluid regulator designed to maintain consistent material pressure in industrial dispensing applications. It helps minimise pressure fluctuations caused by pump cycling, resulting in smoother material flow and more accurate dispensing of mastics, sealants, adhesives, and other high-viscosity materials.
Built for demanding industrial environments, this regulator supports pressures up to 5,000 psi (344 bar) while providing reliable downstream pressure control. It is commonly installed in fluid lines where stable pressure is essential for achieving consistent application quality and reducing material waste.
Key Features
| Part Number | 903958 |
|---|---|
| Product Type | Mastic Fluid Pressure Regulator |
| Maximum Working Pressure | 5,000 psi (344 bar) |
| Regulated Pressure Range | 1,000–4,500 psi (70–310 bar) |
| Maximum Material Viscosity | Up to 80,000 cP |
| Connection Size | 3/4 in. NPT inlet, outlet, and gauge port |
| Material Compatibility | Mastics, sealants, adhesives, and other high-viscosity materials |
| OEM Part | Yes |
Benefits
- Maintains consistent downstream fluid pressure.
- Helps reduce pressure surges created by pump strokes.
- Improves dispensing accuracy for high-viscosity materials.
- Supports reliable operation in demanding industrial applications.
- OEM Graco quality for dependable performance and long service life.
Applications
This regulator is designed for industrial systems handling heavy-bodied materials where controlled fluid pressure is critical. It is suitable for dispensing mastics, sealants, caulks, adhesives, and similar high-viscosity products in manufacturing and production environments.
Frequently Asked Questions
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