Bomag 05542291 Reducing Union

The Bomag 05542291 Reducing Union is a genuine OEM component designed for a broad range of Bomag pavers, rollers, cold milling machines, and recyclers/stabilizers, including BF-series pavers, BW-series single drum rollers, tandem rollers, and pneumatic tyred rollers, as well as BM cold milling machines and MPH and RS recycler/stabilizer models. Sourced directly from Bomag, this reducing union carries the same part number 05542291 found in BOMAG's official parts catalog, so you can order with confidence that this is the correct component. This part delivers a direct, drop-in connection within the hydraulic or fluid system, maintaining proper flow characteristics between lines of differing sizes across all covered machine families.

Key Features

• Genuine OEM Fluid-Path Integrity — manufactured to Bomag's original specification, ensuring correct bore sizing and thread form so fluid transitions between differing line diameters without restriction or leakage
• Direct-Connection Replacement — matches the original port threads and union geometry, installing into the existing fitting location without adapters or re-threading
• Broad Bomag Fleet Coverage — fits BF-series pavers including BF 300, BF 600, BF 700, BF 800, and BF 900 models; BW-series single drum, tandem, and pneumatic tyred rollers; BM cold milling machines including the BM 1000/35, BM 2000/75, BM 2500/75, and related models; MPH and RS recycler/stabilizer models; and the BC 772 RB-4 and related refuse/landfill compactors
• Sustained System Pressure — a correctly seated reducing union maintains the pressure differential between fluid lines, preventing pressure drop, fluid bypass, and the downstream component wear that follows from a degraded or leaking union

A reducing union is a threaded fitting that joins two fluid lines of different diameters within a machine's hydraulic or fluid-transfer system, allowing flow to pass from a larger-bore line into a smaller one — or vice versa — without the need for separate adapters. It maintains a sealed, pressure-rated connection between those lines, and its internal geometry controls flow transition so that pressure is managed correctly at the junction point. When a reducing union fails — through thread wear, cracking, or seal degradation — the result is fluid leakage, loss of system pressure, and potential damage to downstream components including pumps, valves, and actuators, which is why replacing it promptly with an OEM-matched part is critical to keeping the machine fully operational.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

Why Buy From DHS Equipment

Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.

Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.