The Multiquip 505534 is a genuine OEM Coupling with Nut 1/8 NPT designed for Mayco C-series concrete pumps, including the C30HDNI, C30HDNI Precision, C30HDNI Zenith, C30HDN, C30HDG, C30HDGA, and C30HDZ. As a direct OEM replacement, this coupling is sourced and validated by Multiquip to meet the original design requirements of these Mayco pump models. Verify your model code against the fitment list before ordering to ensure a correct match for your machine.
Key Features
- Genuine OEM Fluid Connection Integrity — Manufactured to Multiquip OEM specification, ensuring the 1/8 NPT thread form and coupling body dimensions match the original hydraulic or fuel line connection point exactly.
- Threaded NPT Design — The 1/8 NPT tapered thread profile creates a pressure-tight seal when properly torqued, with no additional adapters or fittings needed at the connection point.
- Broad C30-Series Compatibility — Confirmed fitment across multiple C30HD variants including C30HDNI, C30HDNI Precision, C30HDNI Zenith, C30HDN, C30HDG, C30HDGA, and C30HDZ concrete pumps.
- Leak-Free Line Integrity — A properly seated coupling maintains consistent fluid pressure throughout the pump circuit; a failed or cross-threaded coupling can cause fluid loss, pressure drop, and unplanned pump shutdowns.
- Fuel and Hydraulic System Safety — Correct coupling fitment is critical in fuel and hydraulic circuits where leaks present both a fire hazard and a contamination risk; using the correct OEM part eliminates guesswork on thread compatibility.
A coupling with nut is a threaded pipe fitting used to join two sections of line — fuel, hydraulic, or coolant — within the pump's internal circuit. The 1/8 NPT designation refers to the National Pipe Taper thread standard, where the tapered thread compresses against the mating fitting as it is tightened, forming a seal without the need for a separate gasket. When a coupling cracks, strips, or develops a leak, fluid pressure in that circuit drops, which can starve downstream components and cause the concrete pump to lose output or shut down entirely. Replacing a worn coupling promptly with the correct OEM part restores sealed, leak-free operation and protects the surrounding components from fluid damage.
Part Details
| Part Number | 505534 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Coupling with Nut 1/8 NPT |
Compatibility & Fitment
| Name | Model |
|---|---|
| Mayco Pumps | C30HDNI |
| Mayco Pumps | C30HDNI Precision |
| Mayco Pumps | C30HDN |
| Mayco Pumps | C30HDNI Zenith |
| Mayco Pumps | C30HDG |
| Mayco Pumps | C30HDZ |
| Mayco Pumps | C30HDGA |
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.
