The Graco 103413 O-Ring Packing is an OEM genuine sealing component built specifically for Graco airless paint sprayers. It creates a leak-free barrier inside the pump fluid section, preserving consistent spray pressure and protecting the pump from internal fluid damage. The table below covers everything you need to confirm this is the right part for your machine.
| Attribute | Detail |
|---|---|
| Part Number | 103413 |
| Part Type | O-Ring Packing — Fluid Section Seal |
| Brand | Graco — OEM Genuine Part |
| Primary Function | Prevents fluid leaks and maintains consistent operating pressure |
| Material | High-pressure rated elastomer |
| Installation | Tool-minimal — seats directly into the O-ring groove in the pump housing |
| Compatible Series | Mark IV HD · ProContractor Series · 390 PC Electric Airless |
| Compatible Models | 17E603 · 17E604 · 17C305 · 17C310 · 17C313 |
| Condition | New — OEM Factory Part |
The Graco 103413 O-Ring Packing is the factory-specified fluid section seal for select Graco airless sprayer models. When this O-ring wears out, pressure drops, fluid bypasses the pump seal, and spray quality suffers immediately. The table below outlines the core specifications so you can confirm this is the right component before ordering.
| Specification | Detail |
|---|---|
| OEM Part Number | 103413 |
| Component Type | O-Ring Packing |
| Location in Sprayer | Fluid section — pump housing O-ring groove |
| Function | Creates a pressure-tight seal to prevent fluid bypass and pump leaks |
| Material Rating | High-pressure rated elastomer |
| Part Classification | OEM Graco — not aftermarket |
| Condition | New — OEM Factory Part |
Choosing the right O-ring is not just about fit — it is about sustained performance under pressure. The table below breaks down each feature of the Graco 103413 alongside the real-world benefit it delivers on the job.
| Feature | Benefit to You | Priority |
|---|---|---|
| OEM Precision Fit | Seats perfectly in the housing groove — no gaps, no bypass leaks | Critical |
| High-Pressure Durability | Resists compression set and outlasts generic seals under continuous cycling | Critical |
| Leak Prevention | Stops fluid migrating into mechanical pump components — prevents costly secondary damage | Critical |
| Consistent Pressure | Maintains the steady tip pressure needed for a smooth, uniform spray pattern | High |
| Fast Replacement | Minimal disassembly required — keeps downtime short and crews moving | High |
| Low Cost | An affordable OEM replacement that prevents expensive pump rebuilds | Bonus |
The 103413 O-Ring Packing fits across Graco’s Mark IV HD, ProContractor, and 390 PC electric airless sprayer families. Confirm your model number in the table below before purchasing.
| Model No. | Sprayer Name | Series |
|---|---|---|
| 17E603 | Mark IV HD 3-in-1 Standard Series Electric Airless Sprayer | Mark IV HD |
| 17E604 | Mark IV HD 3-in-1 ProContractor Series Electric Airless Sprayer | ProContractor |
| 17C305 | Pro210es Electric Airless Sprayer | Pro210es |
| 17C310 | 390 PC Electric Airless Sprayer Stand | 390 PC |
| 17C313 | 390 PC Electric Airless Sprayer Hi-Boy | 390 PC |
Always verify compatibility against your unit’s official Graco parts diagram before ordering.
A worn O-ring rarely fails all at once — it shows warning signs first. The table below maps common symptoms to their root cause and urgency so a small problem does not become an expensive pump repair.
| Symptom | What It Means | Urgency |
|---|---|---|
| Fluid leaking from pump body | O-ring is no longer seating — fluid is bypassing the seal entirely | Replace Now |
| Loss of spray pressure | Worn seal allows pressure to bleed off before reaching the tip | Replace Now |
| Sprayer cycling too often | Pump is working overtime to compensate for pressure loss | Replace Soon |
| Visible O-ring wear or cracking | Seal is degraded on inspection — failure is imminent | Replace Soon |
| Annual service interval reached | Proactive swap prevents unexpected job-site failure | Preventive |
Replacing the 103413 O-Ring Packing does not require a technician. The process takes under 30 minutes with basic hand tools. Follow the six steps below in order and consult your Graco service manual for torque specifications.
| Step | Action | Notes |
|---|---|---|
| 1 | Relieve all pressure | Trigger the gun and turn the pressure knob to minimum before touching the pump |
| 2 | Flush the fluid section | Run clean solvent through to stop dried coating from contaminating the new seal |
| 3 | Disassemble pump housing | Follow your Graco service manual for correct bolt sequence and torque specs |
| 4 | Remove the old O-ring | Use a plastic pick — metal tools scratch the groove and cause the next seal to leak |
| 5 | Seat the new 103413 O-ring | Press fully and evenly into the groove — check for uniform seating all the way around |
| 6 | Reassemble and leak-test | Run at low pressure first and confirm no leaks before returning to full operating pressure |
The most common questions customers ask about the Graco 103413 O-Ring Packing. Click any question to expand the answer.
