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Graco B25BB1 Bellows Pump Assembly 50cc SMT

High-performance replacement bellows pump assembly for Merkur 25:1 systems with U-cup packing. Ideal for industrial coatings and moisture-sensitive materials.

  • Part Number: B25BB1
  • Displacement: 50cc per stroke
  • Ratio: 25:1
  • Packing Type: U-cup
  • Compatible Machines: Merkur Bellows 25:1 SMT systems
  • Optional: DataTrak compatible

$7309.58
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Compatible Machines

Model Description
G25B02 Merkur Bellows 25:1 Pump Only – Wall Mount
G25B04 Merkur Bellows 25:1 Pump Only – Cart Mount
G25B10 Merkur Bellows 25:1 Pump & Gun – Wall Mount
G25B12 Merkur Bellows 25:1 Pump & Gun – Cart Mount
G25B14 Merkur Bellows 25:1 – Cart Mount, V‑Packing
G25B18 Merkur Bellows 25:1 – Wall Mount, U‑Cup & DataTrak
G25B22 Merkur Bellows 25:1 – Cart Mount, U‑Cup & DataTrak
G25B34 Merkur Bellows 25:1 Electrostatic Package

Product Overview

Part Number: B25BB1
Product Name: Graco B25BB1 Pump Assy Bellows 50cc SMT

This is a genuine Graco replacement bellows pump assembly for Merkur 25:1 air‑assisted/airless spray systems that require a 50 cc SMT pump with U‑cup packings and DataTrak compatibility.

Key Features

  • 50 cc displacement per cycle for consistent fluid delivery
  • 25:1 ratio piston bellows pump for high‑pressure coating applications
  • U‑cup packing design ideal for UV, isocyanates, and moisture‑sensitive materials
  • SMT (Split‑Mount Technology) for modular serviceability
  • DataTrak compatible to allow monitoring and control (optional)
  • Durable wetted parts: PEEK, PTFE, stainless steel, tungsten carbide and UHMWPE

Technical Specifications

Fluid Inlet 3/4" NPT
Fluid Outlet 3/8" NPT
Air Inlet 1/2" NPT
Stroke 63.5 mm (2.5")
Max Working Pressure Up to 2500 psi
Packing Type U‑cup
Compatible Fluids Solventborne, waterborne, high solids, UV coatings

Frequently Asked Questions

The B25BB1 is the bare pump assembly only — accessories such as air controls, hoses, and guns are sold separately or included with complete sprayer packages.

Yes — B25BB1 is DataTrak compatible, allowing optional electronic monitoring and diagnostics if used with a DataTrak system.

This assembly replaces pump units that use a 50 cc bellows lower and U‑cup packing. Verify your model’s pump ratio and packing type before ordering.

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