Bomag 05542326 Reducing Union

The Bomag 05542326 Reducing Union is a genuine OEM component designed for BW-series single drum rollers, BW-series tandem rollers, and BM-series cold milling machines. As a direct OEM replacement, this reducing union is manufactured to the same specifications as the original part it replaces, ensuring a correct, leak-free connection within the hydraulic or fluid circuit. This part fits a wide range of Bomag equipment, including the BW 172 D-2, BW 138 AD, BW 184 AD, BW 120 AD-4, BW 151 AD-5 AM, BM 500/15, BM 500/15 Stage V, BM 600/15 Stage V, and additional models across the BW and BM families.

Key Features

• Genuine OEM Construction — machined and rated to Bomag's original fluid-connection specifications, ensuring correct thread form, sealing surface, and pressure tolerance for this reducing union application
• Drop-In Replacement — matches the original port sizing and thread pitch on both ends, connecting two different-diameter lines without reworking existing fittings or lines
• Broad Bomag Compatibility — fits BW-series tandem rollers including BW 120 AC-3, BW 120 AD-3, BW 120 AD-4, BW 131 ACW-2, BW 131 ACW-3, BW 131 ACW-5, BW 138 AC, BW 138 AD, BW 151 AC-2, BW 151 AD-5 AM, BW 161 AC-4, BW 164 AD, BW 170 AD, BW 170 AD-2 AM, BW 184 AD, BW 184 AD-2, BW 184 AD-2 AM, BW 115 AC-3, BW 115 AC-5, and BW 170 AP AM; the BW 172 D-2 single drum roller; and BM 500/15, BM 500/15 Stage V, BM 500/15-2, BM 600/15 Stage V, and BM 600/15-2 cold milling machines
• Leak-Free Fluid Transfer — a correctly seated reducing union maintains system pressure and prevents fluid loss; a worn or damaged union can cause pressure drop, fluid contamination, or system failure that brings the machine to a stop
• Verified Part Number — order with confidence using Bomag part number 05542326 to confirm you are receiving the exact fitting specified for your machine

A reducing union is a threaded fitting that joins two fluid lines of different diameters within a hydraulic or cooling system, allowing fluid to transition between line sizes without losing pressure or flow integrity. In compaction rollers and cold milling machines, these fittings are common in hydraulic circuits, water systems, and engine cooling lines where routing demands require a size change. When a reducing union cracks, corrodes, or develops thread damage, it can cause fluid leaks, loss of system pressure, and ultimately machine downtime — making timely replacement with a correctly sized OEM fitting essential to keeping fluid systems operating as designed.

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.