Graco 257352 Prime Valve Kit

The Graco 257352 Prime Valve Kit is a heavy-duty replacement valve that ensures smooth priming and pressure control in Graco airless sprayers. Ideal for restoring performance and preventing leaks.

OEM Part #: 257352
Function: Controls prime/spray flow
Fits: Ultra Max II 695 & 795 Series
Type: Genuine Graco heavy-duty valve kit

List Price: $241

You save: $63.14 (26.20%)

Sale Price: $177.86

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Description

Prime/Drain Valve Overview for Graco 257352 Prime Valve Kit

Compatible Machines

Ultra Max II 695 — Lo-Boy Series B (SKU: 255130, 255131)
Ultra Max II 695 — Hi-Boy Series D (SKU: 249642, 249644)
Ultra Max II 795 — Hi-Boy Series C (SKU: 249646, 249648)

What is the 257352 Prime Valve Kit?

The Graco 257352 Prime Valve Kit is a heavy-duty prime/drain valve assembly that controls priming and recirculation on select Graco airless paint sprayers. Replacing a worn prime valve restores reliable priming, helps eliminate air ingestion, and reduces leaks at the drain port.

Key Details

OEM Part #	257352 (Prime/Spray or Prime/Drain Valve Kit)
Function	Controls Prime (recirculation to return line) vs Spray (flow to hose/gun)
Typical Symptoms	Won’t hold pressure in Spray, constant bypass to drain, difficulty priming, drips at drain fitting
Included	Heavy-duty valve body/seat components (kit contents as supplied by Graco for the 257352 assembly)
Notes	Always match part to model, series, and serial range; similar sprayers can use different valves across revisions.

Fitment Guidance

Confirm your sprayer’s exact model (e.g., Ultra Max II 695), configuration (Hi-Boy/Lo-Boy), and Series (B/C/D, etc.).
Check the parts manual for your serial range to ensure it specifies 257352.
Replace worn O-rings/seals and flush system after installation to remove debris.

Frequently Asked Questions

It switches flow between Prime (recirculates material back to the return line for priming/pressure relief) and Spray (routes flow to the hose and gun). A worn valve can cause pressure loss, hard priming, or continuous bypass to drain.

Match your sprayer’s model, series (B/C/D, etc.), and serial range against the parts manual. If your unit isn’t one of the documented fits above, confirm before purchase—Graco changed valve part numbers across revisions and configurations.

Follow the Graco service guidance for your model. Typically, use the recommended thread sealant on NPT threads and replace any O-rings provided in the kit. Avoid over-torqueing to prevent cracking the manifold or damaging seats.

Inspect for debris on the valve seat, verify gun and hose connections, check manifold filter, and ensure the pump packings aren’t bypassing. If issues persist, re-prime and purge air; consult the parts manual for additional diagnostics.

Not universally. Graco uses different valve bodies/kits by model and series. Use 257352 only where it is specified or superseded by Graco for your exact configuration.