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
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.
