Multiquip 21585 Straight Fitting 20Mo 16Fo

The Multiquip 21585 Straight Fitting 20Mo 16Fo is a genuine OEM hydraulic fitting designed for HTX44 and STX55 series hydrostatic ride-on power trowels. As a direct OEM replacement, part 21585 is manufactured to the exact specifications required by the hydraulic system on these machines, ensuring a secure, leak-free connection without modification. This fitting is confirmed to fit the HTX44K4, HTX44K5, HTX44Y4, HTX44Y5, STX55J6, and STX55Y6 models. Sourcing the correct OEM fitting is critical in high-pressure hydraulic circuits — even a marginal mismatch in thread form or port size can compromise system pressure and machine control.

Key Features

• Genuine OEM Hydraulic Integrity — Manufactured to Multiquip's exact thread form and port dimensions, maintaining rated pressure capacity in the trowel's hydraulic circuit.
• Straight 20Mo to 16Fo Port Configuration — Connects male 20 and female 16 hydraulic line ends in a straight-through orientation, matching the original routing of the hydraulic plumbing on these trowels.
• Broad HTX44 and STX55 Compatibility — Fits HTX44K4, HTX44K5, HTX44Y4, HTX44Y5, STX55J6, and STX55Y6 hydrostatic ride-on trowel models.
• Leak-Free Hydraulic Connection — Correct thread engagement prevents seepage under operating pressure, protecting hydraulic fluid levels and sustaining consistent blade pitch and drive response.
• Hydraulic System Safety — A properly seated fitting maintains system pressure integrity; a failed or mismatched fitting can cause loss of blade control or drive function, creating a safety hazard on the finishing floor.

A straight hydraulic fitting like the Multiquip 21585 serves as a rigid inline connector within the trowel's hydraulic plumbing, joining two hydraulic lines or ports in a direct, non-angled path. In hydrostatic ride-on trowels, the hydraulic system governs both blade pitch adjustment and machine propulsion, so every fitting in the circuit must hold rated pressure without weeping or leaking. When a fitting cracks, cross-threads, or loses its seal, hydraulic pressure drops, blade response becomes inconsistent, and the machine may lose drive capability entirely — making prompt replacement with the correct OEM part essential.

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.