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Graco GMAX II 3900 sits at the sweet spot of Graco’s gas line: light enough for one-man loading, powerful enough to push 0.95 gpm at 3 300 psi through a 0.031″ tip. The secret is 16X414 Endurance™ Vortex MaxLife pump, a rotating Chromex rod lower that lasts up to three times longer than flat-stroke steel. When this pump—and graco hoses, guards and filters attached—finally wear, you need genuine parts fast. That’s where SprayersAndParts.com delivers: we stock our site with every factory screw, seat and O-ring.
| Attribute | Specification |
|---|---|
| Max Working Pressure | 3 300 psi / 227 bar |
| Max Flow Rate (16X414) | 0.95 gpm / 3.6 l min |
| Engine | Honda GX 160 5.0 hp (recoil) |
| Recommended Tip (1 gun) | 0.029–0.031″ RAC X LP or WideRAC |
| Fluid Inlet / Outlet | 1-5/16″ UN / 3/8″ NPSM (fits BlueMax II® hose) |
Will 16X414 fit my 2013 GMAX II 3900?
Yes—clutch and frame pattern unchanged since 2011; upgrade to ProConnect 2 door if running early Gen-1.
Which seat for solvent enamels?
Stick with MaxLife carbide; stainless seats pit after 150 gal xylene-based coatings.
Can I push a 0.035″ tip?
Single gun yes, keep hose ≤150 ft and pressure ≤3 200 psi. For three guns use 0.025–0.027″.
Ready to Swap in Power & Swap Out Downtime?
Add the 16X414 vortex pump, BlueMax hose and Contractor PC gun to your cart. SprayersAndParts ships —so you spray profit tomorrow.