The Honda 91303-ZE5-003 O-Ring (47.7X2.5) is a genuine OEM replacement seal designed for HRM21 and HRS21 lawn mowers and HS522 and HS622 two-stage snow blowers. As a direct Honda OEM part, this O-ring is manufactured to the exact dimensional specification — 47.7 mm inner diameter, 2.5 mm cross-section — that Honda engineers specified for these machines. Confirm your serial number against the fitment table before ordering, as Honda may list more than one O-ring variant across production runs. DHS Equipment sources this component directly from Honda, so you receive an authentic part backed by Honda's own quality standards.
Key Features
- Exact OEM Dimensions — produced to Honda's specified 47.7 × 2.5 mm profile, ensuring the sealing surface seats correctly and holds against fluid or air pressure without gap or distortion
- Genuine Honda OEM Part — sourced directly from Honda, not a substitute; part number 91303-ZE5-003 matches Honda's own catalogue entry for these machines
- Broad Model Coverage — listed for HRM21 and HRS21 lawn mowers and HS522 and HS622 two-stage snow blowers; check your serial number against the fitment table to confirm the correct ring for your unit
- Leak Prevention — a deteriorated or deformed O-ring allows fluid or air to bypass the sealing point, leading to performance loss or contamination; replacing this part restores the intended seal
An O-ring is a circular loop seal used to prevent the passage of fluid or air between two mating surfaces. When compressed between those surfaces, it fills the gap and blocks leakage. Over time, heat cycles, chemical exposure, and mechanical compression cause the rubber to harden, crack, or take a permanent set — at which point the seal fails and leakage begins. Replacing the O-ring with a correctly sized, OEM-grade part restores the integrity of the sealed joint and prevents the downstream issues that come with an uncontrolled leak.
Part Details
| Part Number | 91303-ZE5-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | O-Ring (47.7X2.5) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Lawn Mower | HRM21, HRS21 | All |
| Two-Stage Snow Blower | HS522, HS622 | 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.
