The Honda 15620-ZG4-003 Oil Filler Cap is a genuine OEM replacement designed for WT30 and WT40 water pumps. Sourced directly from Honda, this cap is the exact component used in original production — no guesswork on fit or function. It services both the WT30 and WT40 pumps, so confirm your pump model and verify the part number 15620-ZG4-003 against your unit's parts diagram before ordering.
Key Features
- Genuine OEM Seal — manufactured by Honda to the same specification as the original, ensuring the oil filler opening is properly closed and sealed during operation
- Direct Drop-In Replacement — threads directly into the oil filler port with the correct pitch and profile for WT30 and WT40 water pumps, requiring no modification
- Check Your Serial Number — Honda updates parts at production breaks, so cross-reference your pump's serial number against the fitment table to confirm this is the right cap for your unit
- Protects Engine Oil — a missing or damaged cap allows contaminants into the crankcase and lets oil escape during operation, leading to accelerated wear or pump failure
The oil filler cap closes and seals the opening through which engine oil is added to the crankcase of the water pump's engine. It keeps the oil supply free from dirt, debris, and moisture that would otherwise degrade lubrication and cause internal wear. A cracked, missing, or poorly seating cap allows oil to splash out under vibration and exposes the crankcase to contamination — both conditions that can shorten engine life significantly if left unaddressed.
Part Details
| Part Number | 15620-ZG4-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Oil Filler Cap |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Water Pump | WT30, WT40 | 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.
