Graco 166057 Piston Seal
$54.50
In Stock
The Graco 166057 Piston Seal ensures tight sealing within the pump’s piston assembly, maintaining pressure and preventing internal leaks.
- OEM replacement for electric airless pump lowers
- Restores spray consistency and pressure
- Durable and easy to install
- Ideal for maintenance or pump rebuilds
Quantity
Genuine OEM Part
Fast Shipping (Order by 1 PM CST)
Easy Returns
Overview & Key Details
Compatible Machines
Used in select Graco electric airless sprayer pump lowers. Confirm by checking your unit’s parts manual and pump lower code.
- Graco 390 PC / 390 ST
- Graco 395 PC / Ultra 395
- Graco 490 PC Pro
- Graco 495 PC Pro
- Graco 595 PC Pro
Graco 166057 Piston Seal is an OEM seal for the piston area of the fluid section. It maintains pressure, prevents internal bypass, and supports consistent spray performance. Replace when experiencing pressure loss, inconsistent output, or internal leakage during pump operation.
Key Features
- OEM fit for the piston location in compatible pump lowers
- Helps restore prime, pressure stability, and atomization quality
- Designed to reduce internal leakage/bypass for steady flow
- Ideal for preventive maintenance during pump rebuilds
Technical Details
| Part Number | 166057 |
|---|---|
| Part Type | Piston seal (fluid section) |
| Application | Electric airless sprayer pump lowers (select models listed above) |
| Function | Seals around piston to contain high-pressure fluid and prevent bypass |
| Installation Tip | Lightly lubricate seal; inspect piston rod/cylinder for scoring before assembly |
| Authenticity | Genuine OEM replacement part |
When to Replace
- Loss of pressure or difficult priming
- Inconsistent spray pattern or output
- Visible internal leakage during service
Frequently Asked Questions
Check your sprayer’s model, serial range, and the pump lower code in the official parts manual. The parts diagram should list 166057 at the piston seal position. If unsure, share the pump code with your distributor for verification.
Inspect the piston rod and cylinder wall for wear or scoring. Replace damaged components to avoid premature seal failure. Clean the groove, remove debris, and lubricate the new seal before installation.
Non-OEM seals may differ in material and profile, affecting pressure retention and lifespan. For best performance and fit, use the genuine part number listed in your machine’s parts breakdown.
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