Graco 166026 Piston Seal
$79.00
In Stock
Essential piston seal for Graco contractor pumps—restores pressure and stops bypass. Check your sprayer’s parts manual to confirm the part number before ordering.
- Part No.: 166026 (166-026)
- Fits: Ultra Max II 695, 795, 1095, 1595 (verify pump listing)
- Function: Seals piston to cylinder in the fluid section
- Replace when: Pressure drops, surging, or paint bypass occurs
- Install tip: Clean surfaces, lightly lubricate, avoid twisting, test pressure after
Quantity
Genuine OEM Part
Fast Shipping (Order by 1 PM CST)
Easy Returns
Compatibility & Technical Overview
Compatible Machines
This piston seal fits the following Graco contractor-grade sprayers (verify by parts manual before ordering):
- Ultra Max II 695
- Ultra Max II 795
- Ultra Max II 1095
- Ultra Max II 1595
- Other Graco sprayers using the same displacement pump where part 166026 is specified
What it is
The 166026 piston seal is used in the pump’s fluid section to seal the reciprocating piston against the cylinder, maintaining pressure and preventing bypass for consistent spray output.
Key Benefits
- Restores pressure and smooth spray pattern when the original seal is worn
- Built to OEM dimensions for reliable fit and performance
- Durable elastomer design for professional-duty applications
Quick Specs
| Part Number | 166026 (166-026) |
|---|---|
| Component Type | Piston Seal (fluid section) |
| Application | Airless sprayer displacement pump seal |
| When to Replace | Pressure drop, paint bypass, pulsing, or uneven pattern |
Fitment Tips
- Confirm by checking your sprayer’s parts manual or pump exploded view for 166026
- Inspect piston and cylinder surfaces; clean and lubricate per pump instructions before install
- After assembly, test for proper pressure build and leaks
Frequently Asked Questions
| Question | Answer |
|---|---|
| How do I confirm compatibility? | Match the part number in your sprayer’s parts list; if the pump diagram specifies 166026, this is the correct seal. |
| What symptoms indicate a worn piston seal? | Reduced pressure, visible bypass/leakage, surging output, and inconsistent fan pattern. |
| Do I need other parts when replacing the seal? | It’s good practice to inspect packings, backup rings, and piston surfaces; replace any worn items during service. |
| Any installation best practices? | Depressurize, clean components, lightly lubricate, seat the seal without twisting, and verify pressure after reassembly. |
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