Graco 16X421 ProConnect Endurance Pump

The image above displays the Graco 16X421 ProConnect Endurance Pump — a genuine OEM replacement part built for professional Graco sprayers. It highlights the pump’s precision-engineered metal body and durable construction, designed for high performance and reliability.

Quick-Change Design: Features Graco’s ProConnect system for fast, on-site pump replacement.
Durability: Part of the Endurance Series, offering long service life and consistent pressure output.
Compatibility: Fits TexSpray Mark V, GMAX II 5900 HD, and TexSpray 5900HD ProContractor models.
Professional Quality: Engineered for contractors and painters who demand dependable performance on every job.

This screenshot emphasizes the pump’s authenticity, OEM quality, and current pricing as displayed on sprayersandparts.com.

Retail Price: $1340

You save: $214.4 (16.00%)

Our Price: $1125.6

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Description

Overview & Key Details of the Graco 16X421 ProConnect Endurance Pump

Compatible Machines

Graco Mark V (5900) ProContractor Series
Graco TexSpray 5900 HD (Mark V) ProContractor Series
Graco Mark V (general Mark V family with ProConnect pump lower)

Tip: If your exact sprayer variant isn’t listed, verify the pump lower part number in your unit’s parts manual for a precise match with 16X421.

What Is It?

The Graco 16X421 ProConnect Endurance Pump is a complete fluid-section (pump lower) replacement for select Mark V/TexSpray 5900 HD professional airless sprayers. It features Graco’s ProConnect quick-change system for fast, on-site swap-outs and the durable Endurance design for long service life in demanding, daily use.

Key Features

ProConnect quick-change: minimize downtime with rapid pump lower replacement.
Endurance wear package: engineered components for extended life and lower ownership cost.
Smooth, consistent output ideal for high-production interior/exterior coatings.
Direct replacement assembly—no guesswork on seals, valves, or stack-up.

Technical Specifications

Model / Part No.	16X421
Pump Type	Endurance displacement pump (fluid section / pump lower)
Change System	ProConnect quick-change
Max Working Pressure	3300 psi (22.7 MPa)
Fluid Inlet	1-5/16-12 UN (male)
Fluid Outlet	3/8 in NPT (female)
Typical Materials	Architectural coatings (primers, acrylics, latex, elastomerics) within machine rating

What’s Included

Fully assembled 16X421 pump lower (displacement assembly)
Factory-configured check components and wear parts inside the assembly

Installation may reuse your existing drive, filter, and hose assemblies (model-dependent). Always follow your unit’s service manual.

Frequently Asked Questions

Check your sprayer’s parts manual for the pump lower number. If it lists 16X421, you’re good to go. For Mark V/TexSpray 5900 HD ProContractor units, 16X421 is the standard ProConnect Endurance pump lower.

Max working pressure is 3300 psi. Fluid inlet is 1-5/16-12 UN (male); outlet is 3/8 in NPT (female).

ProConnect lets you swap the pump lower quickly on site—ideal for minimizing downtime during high-volume work. It’s a direct, factory-built assembly for reliable performance.

Compatible with typical architectural coatings (e.g., primers, acrylics, latex, elastomerics) within your sprayer’s rated tip sizes and pressure. Always follow the material manufacturer’s instructions and your unit’s specifications.

Fitment & Installation Notes

Only for machines designed to use a ProConnect Endurance pump lower.
Use OEM seals and lubricants; prime and pressure-test after installation.
If unsure, provide your exact sprayer model and serial to confirm compatibility with 16X421.