Description
Overview:
The Breather Tube (MPN 15721-ZM1-000) is a genuine Honda OEM hose for small petrol engines, including the GCV135 and GCV135E used in walk‐behind mowers such as the HRB425 CQX and HRG415 PDE (Izy). Made from durable rubber, it vents crankcase gases safely to prevent pressure build-up inside the engine. Correct ventilation helps limit oil mist leaks, supports clean running, and protects engine seals. This direct-fit tube restores the proper breather path for blow‐by vapours, helping to keep the intake system cleaner. Built to Honda specification for flexibility and resilience, it resists heat, vibration, and weathering for reliable service. It is a straightforward replacement for perished or split hoses and is suitable for both home users and professional maintenance of Honda lawn mowers.
Key Features:
- Genuine Honda OEM part for assured compatibility and fit (MPN 15721-ZM1-000)
- Durable rubber construction resists oil, fuel, heat, and vibration
- Maintains correct crankcase ventilation to prevent pressure build-up
- Helps reduce oil leaks and supports smooth, stable running
- Direct-fit design for GCV135-series applications used on HRB/HRG mowers
- Simple push-fit replacement; no special tools needed
- Supports easier starting and consistent idling by keeping ventilation clear
- Built to Honda tolerances for wall thickness and flexibility
- Suitable for domestic and professional mower maintenance
- Replaces cracked, hardened, or blocked breather hoses
Typical Applications:
Used during routine servicing or repairs of Honda walk-behind lawn mowers to restore proper engine breathing. Ideal when engines show signs of oil mist around the breather area, unstable idling, or when the original hose has hardened, split, or become blocked. Helps preserve engine efficiency and reliability.
Also known as:
Crankcase breather hose, crankcase vent tube, engine vent hose, rocker cover breather hose, ventilation tube, PCV breather hose (small engine type).
Fits Models:
GCV135, GCV135E, HRB425 CQX, HRB425CQX, HRG415 PDE, HRG415 SD, HRG415C2 PDEE/A, HRG415C2 SDEE/A, HRG415C2-PDEE/A, HRG415C2PDEE/A, HRG415C2SDEE/A, HRG415C3 PDEE, HRG415C3 SDEE, HRG415C3PDEE, HRG415C3SDEE, HRG415PDE, HRG415SD, HRG465C2 PDEE/A, HRG465C2 SDEE/A, HRG465C2PDEE/A, HRG465C2SDEE/A, HRG465C3 PDEE, HRG465C3 SDEE, HRG465C3PDEE, HRG465C3SDEE, HRG536 PDE, HRG536PDE
Alternate Part Numbers:
15721-ZM1-000, 15721ZM1000
Product Specifications
| L&S Part No. | 15721 ZM1 000 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Honda |
| OEM No. | 15721ZM1000 |
| Unit of Sale | 1 |
| Applications | GCV135, GCV135E, HRB425 CQX, HRB425CQX, HRG415 PDE, HRG415 SD, HRG415C2 PDEE/A, HRG415C2 SDEE/A, HRG415C2-PDEE/A, HRG415C2PDEE/A, HRG415C2SDEE/A, HRG415C3 PDEE, HRG415C3 SDEE, HRG415C3PDEE, HRG415C3SDEE, HRG415PDE, HRG415SD, HRG465C2 PDEE/A, HRG465C2 SDEE/A, HRG465C2PDEE/A, HRG465C2SDEE/A, HRG465C3 PDEE, HRG465C3 SDEE, HRG465C3PDEE, HRG465C3SDEE, HRG536 PDE, HRG536PDE |
| Machine Type | Mowers |
| Fits Brands | Honda |
| Fits Models | GCV135 (GJAF) | GCV135E (GJAFE) | HRB425 CQX | HRG415 SD (Izy) | HRG415 PDE (Izy) | HRG536 PDE (Izy) | HRG415C2 (IZY) - PDEE/A | HRG415C2 SDEE/A (Izy) | HRG415C3 PDEE (Izy) | HRG415C3 SDEE (Izy) | HRG465C2 PDEE/A (Izy) | HRG465C2 SDEE/A (Izy) | HRG465C3 PDEE (Izy) | HRG465C3 SDEE (Izy) |
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