Graco 15A210 Lower Diaphragm Housing – OEM Regulator Base Housing
The Graco 15A210 Lower Diaphragm Housing is a precision‑manufactured OEM component designed to form the lower portion of the diaphragm chamber within Graco regulator assemblies. It serves as the foundational structure that holds the diaphragm, spring plate, packing, and other associated internals in correct alignment, enabling reliable and accurate pressure regulation.
Product Overview
This housing is crafted from high‑strength alloy to withstand the stresses of high‑pressure spray systems. It is designed to maintain the internal geometry of the regulator so that the diaphragm and spring assembly operate consistently and reliably. As a direct OEM replacement, the 15A210 ensures accurate fitment and restores factory tolerance for optimum performance.
Key Features
- Genuine Graco OEM part — Part Number: 15A210
- Durable lower housing for the diaphragm chamber
- Maintains proper alignment of diaphragm, spring plate, and packing assembly
- Withstands repeated pressure cycles and high‑stress fluid environments
- Restores original regulator geometry when worn or damaged housing is replaced
Technical Specifications
| Part Number |
15A210 |
| Description |
Lower Diaphragm Housing / Base of Regulator |
| Material |
High‑strength cast or machined metal alloy (OEM specification) |
| Function |
Serves as housing for diaphragm assembly and internal regulator components |
| Application |
Fluid pressure regulators and back‑pressure regulators in Graco finishing systems |
Compatible Systems
- Graco regulators that list 15A210 as the lower diaphragm housing component
- High‑pressure fluid or back‑pressure regulator assemblies requiring the precise diaphragm housing
Installation Guidelines
To install the Graco 15A210 Lower Diaphragm Housing correctly:
- Fully depressurize the system and drain fluid prior to disassembly.
- Disassemble the regulator to remove the existing lower housing, noting internal parts such as the diaphragm, spring plate, and packing.
- Inspect the removed components for wear or damage, especially the diaphragm and spring plate.
- Clean all mating surfaces thoroughly on the new housing and install it ensuring precise alignment.
- Reinsert the diaphragm, spring plate, and packing in correct order and orientation.
- Reassemble the regulator, torque fasteners to manufacturer specification, repressurize slowly and perform a leak and function test.
Maintenance Recommendations
- During routine service, inspect the lower housing for cracks, deformation, or corrosion.
- Ensure the diaphragm seating surface and housing bore remain smooth and free of damage.
- Replace the housing if any structural damage is found, to prevent misalignment or regulator performance degradation.
- Always use correct torque values when tightening fasteners to avoid stress on the housing and maintain integrity.
Frequently Asked Questions
It serves as the foundational base of the diaphragm chamber in the regulator, supporting the diaphragm, spring plate and packing to ensure accurate pressure control.
Yes, the 15A210 Lower Diaphragm Housing is specified by Graco for use in compatible regulator assemblies, ensuring correct fit and performance.
This housing is used in Graco regulator models that list 15A210 in their parts breakdown, particularly those in large‑capacity fluid or back‑pressure regulatory systems.
Replace the housing if you detect structural damage, misalignment, or if the regulator diaphragm assembly no longer performs to specification.
