Bomag 05542303 Reducing Union

The Bomag 05542303 Reducing Union is a genuine OEM component designed for a broad range of Bomag cold milling machines, pavers, single drum rollers, tandem rollers, pneumatic tyred rollers, and recycler/stabilizers. Sourced directly from Bomag, this reducing union delivers an exact-match fit with no guesswork on compatibility. It is confirmed for equipment including BM 1200/30, BM 2000/60-2, and BM 1300/30-2 cold milling machines, BF 600 P-3 S 500 and BF 800 P S500 pavers, BW 213 D-40 and BW 211 D-50 single drum rollers, BW 202 AD-4 and BW 190 AD-4 tandem rollers, BW 11 RH-5 and BW 28 RH pneumatic tyred rollers, and MPH 121 and MPH 122 recycler/stabilizers, among many others. Ordering by part number 05542303 ensures you receive the correct OEM union for your machine.

Key Features

• Genuine OEM Fluid-System Integrity — manufactured to Bomag's original hydraulic/fluid-line specifications, ensuring correct flow reduction, thread form, and sealing surface geometry for this union's specific transition size
• Direct Drop-In Installation — threaded interfaces match the original port dimensions exactly, so this union connects to existing lines and fittings without rework or adapters
• Broad Cross-Fleet Coverage — fits BM-series cold milling machines, BF-series pavers, BW-series single drum, tandem, and pneumatic tyred rollers, MPH and BS-series recycler/stabilizers, and the C850D roller, consolidating a single part across multiple machine types in your fleet
• Leak-Free Fluid Routing — a properly seated reducing union maintains system pressure and flow balance; a worn, cracked, or incorrectly sized union causes fluid leaks, pressure loss, and potential hydraulic or coolant system failure
• Verified by Part Number 05542303 — cross-reference against your machine's parts manual using part number 05542303 to confirm application before installation

A reducing union is a threaded fitting that connects two fluid lines of different diameters within a machine's hydraulic, coolant, or fuel circuit, allowing fluid to transfer from a larger-bore line to a smaller one — or vice versa — without a pressure drop or leak point. It acts as the transition point between mismatched line sizes, keeping fluid moving efficiently through the system. When a reducing union cracks, corrodes, or its threads fail, the affected circuit loses pressure or begins to leak, which can lead to overheating, loss of hydraulic function, or fluid contamination that damages downstream components.

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.