Graco 15B438 Pressure Knob

The Graco 15B438 Pressure Knob allows precise pressure adjustment on Graco pumps and sprayers for consistent fluid flow and system performance.

Durable, OEM-specified construction
Ergonomic and easy to adjust
Maintains stable high-pressure settings
Suitable for high-cycle industrial use

Retail Price: $55

You save: $3.02 (5.49%)

Our Price: $51.98

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Description

Graco 15B438 Pressure Knob – Product Details & Compatibility

Compatible Machines

The Graco 15B438 Pressure Knob is designed for use with Graco spray equipment and high-pressure coating systems where fine control of pump or regulator pressure is required. It fits models that use Graco’s pressure-adjustment assembly and is ideal for both portable and fixed spraying applications.

Graco airless sprayers and coating systems requiring precise pressure adjustment
Hydraulic sprayers and pump modules using Graco pressure-control regulators
Maintenance kits in production or field-service operations needing OEM replacement knobs

Product Overview

The Graco 15B438 Pressure Knob is an OEM replacement component engineered for accurate and repeatable pressure regulation in Graco fluid-delivery systems. With its ergonomic design, robust materials, and precision control features, it enables technicians and operators to dial in the correct pressure settings for consistent fluid flow and finish quality.

Key Features

Precise pressure adjustment via a detented knob mechanism for incremental control
Rugged construction suitable for demanding industrial environments
Compact form factor fits tight spaces in pump or regulator assemblies
Maintains system performance when replacing worn or damaged original knobs

Technical Specifications

Part Number	15B438
Description	Pressure Knob
Function	Adjustment knob for regulating pressure on Graco pumps or spray equipment
Installed In	Graco high-pressure sprayers, hydraulic sprayers, and fluid-delivery systems using Graco regulator assemblies
Dimensions	Approx. 2 × 0.2 × 0.2 inches; 0.3 lb weight
Pressure Range	Supports adjustments within the system’s rated pressure (up to 3000 psi)
Material Highlights	Corrosion-resistant construction, designed for harsh service environments

Usage Notes

Ensure the system is depressurized and isolated before removing or installing the knob.
Verify that the regulator stem or adjustment post is clean and free of debris.
Install the knob aligned properly with the adjustment mechanism; avoid over-torquing.
After installation, adjust pressure gradually and verify stable, repeatable pressure response.
Periodically inspect the knob and adjustment assembly for wear or slippage, especially in high-cycle environments.

Frequently Asked Questions

It enables precise manual adjustment of the system’s pressure through the regulator or pump, helping maintain consistent fluid flow and finish quality.

While substitutes may fit physically, the OEM 15B438 ensures correct indexing, torque calibration, and durability consistent with the original equipment’s performance.

Replace the knob when you observe inaccurate pressure adjustments, slippage, visible wear, cracks, or after extensive use in aggressive service conditions.