Graco 15B338 Reservoir Mounting Fitting – Product Details & Compatibility
Compatible Machines
The Graco 15B338 Reservoir Mounting Fitting is designed for industrial high‑pressure fluid delivery systems and airless sprayer setups using Graco pumps and reservoir assemblies. It serves as a direct mounting interface between the pump body and fluid reservoir, particularly in high‑cycle, demanding coating and transfer applications.
- Graco high‑pressure sprayer systems and pump modules in commercial/industrial finishing operations
- Reservoir assemblies requiring a precision stainless steel mounting fitting for reliable pump integration
- Maintenance kits and retrofit solutions for fluid‑handling systems with frequent cycle, high fluid velocity or high viscosity media
Product Overview
The Graco 15B338 Reservoir Mounting Fitting is a precision‑machined OEM component built from corrosion‑resistant stainless steel, engineered to provide a leak‑proof, low‑dead‑volume connection between the reservoir and pump body. It supports stable fluid flow under high‑pressure conditions, reduces turbulence, and enables on‑site servicing without full manifold replacement.
Key Features
- 316L stainless steel construction for superior corrosion resistance and durability in solvent‑ or water‑based systems
- Low‑shear, optimized fluid passage design to minimise turbulence and pressure drop
- Tool‑free or low‑torque installation: designed for fast maintenance and minimal downtime in production environments
- OEM‑specified interface ensuring exact alignment, concentricity and secure sealing between pump and reservoir
- Validated for high‑cycle performance, vibration resistance and hydrostatic integrity in industrial coating systems
Technical Specifications
| Part Number |
15B338 |
| Description |
Reservoir Mounting Fitting |
| Material |
316L Stainless Steel |
| Function |
Mounting interface between reservoir bowl and pump body; ensures fluid control and sealing under high pressure |
| Installed In |
Graco pumps and reservoir assemblies in high‑pressure spraying/transfer systems |
| Design Tolerance |
Concentricity within 0.02 mm; surface finish ≤16 Ra; electropolished contact surfaces |
| Tested Pressure |
Hydrostatic up to ~6,000 psi; burst pressure ~8× rated working pressure |
Usage Notes
- Always depressurize the system and isolate fluid flow before removing or installing the mounting fitting.
- Inspect the reservoir bowl flange, pump body flange and O‑ring groove for wear, debris or damage before installation.
- During installation, lightly lubricate the O‑ring with a compatible PTFE‑based lubricant, align the fittings, then torque mounting bolts in a star pattern to the manufacturer’s specified value (e.g., ~20 Nm) to ensure uniform compression.
- Replace the O‑ring elastomer at recommended intervals or when contamination is observed; the fitting body itself typically remains serviceable through multiple rebuilds.
- After installation, perform a back‑flow/leak test and monitor system for stable flow rate and pressure to confirm that the fitting is properly seated and sealing.
Frequently Asked Questions
It provides a precise, leak‑proof interface between the fluid reservoir bowl and the pump body, optimising flow, reducing dead volume and ensuring reliable sealing under high‑pressure, high‑cycle conditions.
Using the OEM 15B338 ensures correct dimensions, material compatibility (316L stainless steel), sealing integrity and alignment; substitutes may compromise sealing performance, increase turbulence, or reduce overall system reliability.
Replace the fitting if you observe flange misalignment, surface pitting or corrosion on the stainless steel, O‑ring groove damage, repeated leaks, or failure to maintain system pressure or flow consistency during cycling.
