Graco 16X451 Pump Cylinder

Replacement part for UltraMax II 1095 and 1595 ProContractor
Compatible with GMax II 5900 and 5900 LoBoy models
Ensures stable pressure and extended pump life
Precision-engineered for professional coating applications

Retail Price: $549

You save: $147.13 (26.80%)

Our Price: $401.87

Based on 0 reviews

Description

Graco 16X451 Pump Cylinder a Fitment & Details

Compatible Machines

Graco UltraMax II 1095 ProContractor (Model 16W900)
Graco UltraMax II 1595 ProContractor (Model 16W903)
Graco GMAX II 5900 ProContractor (Model 16W871)
Graco GMAX II 5900 Lo-Boy (Model 16W870)

Tip: Always verify compatibility against your sprayer’s manual or serial-specific parts list before ordering.

What is it?

The Graco 16X451 Pump Cylinder is the OEM fluid section cylinder that houses the pump rod and packings in select UltraMax II and GMAX II sprayers. As an OEM component, it’s engineered for precise fit and long service life in high-pressure airless applications.

Restores optimal pump sealing performance when your existing cylinder is worn or scored.
Maintains factory pressure output and finish quality with genuine Graco tolerances.
Pairs correctly with OEM packings, piston rod, and valve components for reliable rebuilds.

Quick Specs

Part Number	16X451
Type	Fluid section pump cylinder (OEM)
Series Coverage	ProContractor variants of UltraMax II 1095/1595 and GMAX II 5900 (incl. Lo-Boy)
UPC	00633955430259
Replaces/Used With	Used in fluid pump assemblies that include rod/packing kits (e.g., with 16X419-series pumps). Check your manual.

What’s Included & Install Notes

One (1) genuine Graco 16X451 cylinder.
Packings, piston rod, and valves sold separately (reuse only if within tolerance).

Installation should follow the service manual torque sequence. Inspect rod finish and install new packings if wear is present to protect the new cylinder.

FAQs

Compatibility is confirmed for the ProContractor UltraMax II 1095/1595 and GMAX II 5900 (incl. Lo-Boy). For other trims (e.g., Standard/IronMan), check your exact model/serial in the parts manual before purchase.

Persistent pressure loss, scoring/galling inside the cylinder, repeated packing failures, or poor atomization after a rebuild often indicate the cylinder bore is worn and should be replaced.

It’s strongly recommended. Fresh packings protect the new cylinder and help restore factory performance. Mixing old, worn packings with a new cylinder can shorten service life.