Graco 246429 Inlet Valve and Carbide Seat Kit

The Graco 246429 Inlet Valve & Carbide Seat Kit restores suction and performance in your sprayer’s pump lower. It’s an OEM repair kit with durable carbide components built for long life.

Part Number: 246429
Includes: Carbide seat, stainless ball, guide, seals
Fits: Ultra 395/495/595, Ultra Max II 490/495/595, Nova 390, FinishPro 390/395, and more
Use: Replaces worn inlet valve and seat for reliable priming

Retail Price: $59

You save: $4.48 (7.59%)

Our Price: $54.52

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Description

Graco 246429 Inlet Valve & Carbide Seat Kit — Overview

Compatible Machines

The Graco 246429 Inlet Valve & Carbide Seat Kit fits the following airless sprayers and related units (verify your model/series before ordering):

• Ultra 395 (various series)
• Ultra 495 (various series)
• Ultra 595 (various series)
• Ultra Max II 490, 495, 595
• 390 / Nova 390 family
• FinishPro 390/395 (where equipped with compatible pump lower)
• Ultra Max 695 (early generations)
• ST Pro, STX, 295st
• Ultimate Nova 395, Ultimate Super Nova 495
• GMax 3400 (select configurations)
• LineLazer 3400 (select configurations)

What the Kit Does

The Graco 246429 Inlet Valve & Carbide Seat Kit restores proper intake/check-valve sealing in the pump lower so your sprayer can reliably draw and prime material. The carbide seat delivers excellent wear resistance for longer service life, especially with abrasive coatings.

Key Specs

Part Number	246429
Function	Repairs the inlet (intake) valve & seat in the pump lower
Materials	Carbide seat for durability; stainless ball/guide; OEM seals
Typical Symptoms Resolved	Poor suction/priming, cavitation, pressure instability, leaks past inlet
Installation Area	Pump lower (intake side)
Included Components	Carbide seat, ball, guide, O-ring(s)/seal(s) as specified by kit

What’s Included

Carbide valve seat
Stainless steel check ball
Ball guide / retainer
O-ring(s) / sealing components (OEM)

Why a Carbide Seat?

Carbide resists wear from pigments and fillers far better than standard seats, helping your sprayer hold prime and maintain consistent pressure across longer maintenance intervals—ideal for pros running medium-to-high duty cycles.

Fitment Notes

Always confirm your sprayer’s model and series in the parts manual.
Some FinishPro, GMax, and LineLazer units use different lowers—verify before purchase.
Replace worn balls/seats as a set to maintain proper sealing.

Installation & Best Practices

Clean the pump lower thoroughly; keep grit away from the new carbide seat and ball.
Inspect mating surfaces; replace additional seals or the lower if pitting is severe.
Lubricate O-rings with compatible fluid and observe torque guidance from your service manual.
After installation, prime with water/solvent (as appropriate) and check for stable pressure and no bypass.

Frequently Asked Questions

Match your sprayer’s model and series to its parts diagram. If the diagram lists 246429 as the inlet/seat kit for your pump lower, you have the correct part.

Hard or failed priming, pulsation, loss of pressure, cavitation sounds, or material leaking back through the inlet are common signs the inlet valve/seat is worn and needs replacement.

The kit includes the carbide seat, ball, guide, and seals required for the inlet assembly. If other pump-lower parts are scored or pitted, additional components may be needed.

Yes—if you’re comfortable servicing pump lowers. Work cleanly, follow your manual’s torque specs, and test for leaks/prime after assembly. Otherwise, consult a qualified service center.

Carbide offers superior wear resistance versus standard materials, maintaining a positive seal longer—especially with abrasive or high-solids coatings.