The Honda 15721-ZN4-000 Breather Tube is a genuine OEM component designed for GXV50 and GXV57 vertical shaft engines. As a direct Honda OEM part, it is manufactured to the exact specification of the original, ensuring a correct fit without rework or adaptation. This breather tube is confirmed for GXV50 and GXV57 engines — verify your engine's serial number against the fitment table to confirm this is the correct part for your unit. Honda periodically supersedes parts at production breaks, so cross-checking your serial number is always the right move before ordering.
Key Features
- Genuine Honda OEM Quality — sourced directly from Honda, this tube meets the same dimensional and material tolerances as the part installed at the factory, maintaining the integrity of the crankcase ventilation system.
- Correct Routing and Connection — engineered to the exact routing geometry of the GXV50 and GXV57, so it seats properly at both ends without modification or force-fitting.
- Confirmed Fitment — covers GXV50 and GXV57 vertical shaft engines; check your serial number against the fitment table to confirm applicability to your specific unit.
- Crankcase Pressure Control — a properly functioning breather tube keeps crankcase pressure balanced; a cracked, collapsed, or disconnected tube allows pressure buildup that can push oil past seals and degrade engine performance.
The breather tube is part of the crankcase ventilation system on the GXV50 and GXV57 engines. Its job is to route blow-by gases — combustion gases that pass the piston rings and enter the crankcase — back into the intake so they are burned rather than vented to atmosphere. When this tube cracks, collapses, or comes loose, crankcase pressure can rise unchecked, forcing oil past gaskets and seals and causing oil consumption or external leaks. Replacing a damaged breather tube restores proper ventilation and protects the engine's sealing surfaces.
Part Details
| Part Number | 15721-ZN4-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Breather Tube |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Vertical Shaft Engine | GXV50, GXV57 | 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.
