The Magnum ProX19's standout feature is the ProXChange pump system — a tool-free, modular pump cartridge that swaps out on-site in about 4 steps, using a built-in socket on the frame. The complete replacement kit is part 24Y472, compatible with the ProX17, ProX19, and ProX21. On the diagram itself, Ref. 1 is the pump housing (17G447) and Ref. 2 is the ball guide (17D364).
The ProX19 shares its overall design philosophy with the rest of the Magnum line, but its defining feature — the ProXChange pump system — is unique to the ProX tier. This reference decodes that system's diagram and covers the genuine part numbers involved.
1. The ProXChange System, Explained
ProXChange is a modular pump replacement system exclusive to the ProX17, ProX19, and ProX21 models. Rather than sending a worn pump out for service center repair, the entire pump cartridge can be swapped on-site — no tools required, using a socket built directly into the sprayer's frame. Graco markets this as doubling the effective life of the sprayer, since a worn pump no longer means the whole machine is down.
2. ProXChange Pump Diagram Callouts
| Ref. | Component | Part Number |
|---|---|---|
| 1 | Pump Housing | 17G447 |
| 2 | Ball Guide | 17D364 |
| — | Complete ProXChange Pump Replacement Kit | 24Y472 |
Unless you've already isolated a single failed component, ordering the complete ProXChange kit (24Y472) is almost always the more practical choice — it's built as a modular cartridge meant to be swapped as a unit, not disassembled and repaired piece by piece on the job site.
3. How the Tool-Free Swap Works
- Follow the pressure relief procedure completely before touching the pump.
- Use the built-in socket on the frame to release the worn pump cartridge — no external tools needed.
- Remove the worn cartridge and install the replacement ProXChange pump (24Y472) in its place.
- Secure the new cartridge using the same built-in socket mechanism, and the sprayer is ready to run again.
The entire value of the ProXChange system depends on already having a replacement cartridge available when the old one wears out. Ordering the kit reactively, after a pump has already failed mid-job, defeats the purpose of a system designed specifically to eliminate that downtime.
4. ProX19 Core Specs
| Spec | Value |
|---|---|
| Annual Usage Rating | Up to 500 gallons/year |
| Maximum Hose Length | 150 ft |
| Power | Cordless, DEWALT battery platform |
| Pump Type | ProX stainless steel piston pump (ProXChange-compatible) |
| Suction Source | Flexible suction tube — 1 or 5 gallon bucket |
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Frequently Asked Questions
What is the ProXChange pump system on the Magnum ProX19?
A tool-free pump replacement system unique to the ProX17, ProX19, and ProX21. A worn pump cartridge swaps out in about 4 steps using a built-in socket on the frame.
What is the part number for the ProXChange replacement pump?
24Y472 — the complete kit, compatible with the ProX17, ProX19, and ProX21.
What is Ref. 1 on the ProXChange pump parts diagram?
The pump housing, part 17G447. Ref. 2 is the ball guide, part 17D364.
How much can the Magnum ProX19 spray per year?
Up to 500 gallons per year, supporting up to 150 ft of hose and larger tip sizes — above the homeowner-tier X5 and X7.