The Honda 15721-Z0H-000 is a genuine OEM Breather Tube designed for GX25 horizontal shaft engines, HHT25 trimmers, and UMC425 trimmers. As a direct Honda OEM component, this tube is manufactured to the exact dimensions and material tolerances Honda specifies for this application. Confirm your model and serial number against the fitment table before ordering — Honda supersedes parts at serial breaks, and verifying your unit ensures you receive the correct tube for your machine.
Key Features
- Genuine Honda OEM — sourced directly from Honda, this Breather Tube meets the exact dimensional and material requirements for the GX25 engine and the equipment it powers.
- Correct Crankcase Venting — the breather tube routes crankcase vapors properly, maintaining the pressure balance the engine needs to run cleanly without oil weeping or buildup at gasket surfaces.
- Broad Fitment — covers GX25 horizontal shaft engines, HHT25 trimmers, and UMC425 trimmers; check your serial number against the fitment table to confirm applicability to your specific unit.
- Direct OEM Replacement — replaces the original tube with no alterations needed; restores the crankcase breather circuit to as-built condition.
The breather tube is a small but essential component of the engine's crankcase ventilation system. It routes blow-by gases and crankcase pressure away from the sealed engine interior, typically directing them back into the air intake so the engine can burn them off cleanly rather than expelling them into the air. When this tube cracks, collapses, or becomes blocked, pressure builds inside the crankcase, forcing oil past seals and gaskets and leading to oil leaks, fouled air filters, and rough running. Replacing a damaged or deteriorated tube restores proper crankcase breathing and protects the engine's sealing surfaces.
Part Details
| Part Number | 15721-Z0H-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Breather Tube |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX25 | All |
| Trimmer | HHT25, UMC425 | All |
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.
