# 7201 Dunbier Hydrastar Filler Cap # 32-7640 | Marine Trailer Part

🔧 Product Description

  

Dunbier Hydrastar Replacement Reservoir Filler Cap - 32-7640 - Part Number: 7201

  

A genuine-style service component for all Hydrastar HBA-series electric-over-hydraulic actuators. The supplied component is all-weather plastic filler cap with seal and is used to closes the brake-fluid reservoir and limits contamination.

  

⚙️ Key Features

  

• Application: all Hydrastar HBA-series electric-over-hydraulic actuators

• Component: all-weather plastic filler cap with seal

• Designed for electric-over-hydraulic trailer braking

• Direct service replacement when the actuator model matches

• Marine-trailer maintenance component

  

📏 Specifications

  

• Type: all-weather plastic filler cap with seal

• System: Hydrastar electric-over-hydraulic braking

• Compatibility must be confirmed from actuator generation and service reference

  

🔄 Cross Reference & Related Parts

  

• Dunbier: 7201

• Hydrastar: 32-7640

• Alternate references: Dexter 247634 / HBA-BC

  

🚤 Trailer Compatibility & Application

  

• Suitable for all Hydrastar HBA-series electric-over-hydraulic actuators

• Hydraulic and electrical work must match the actuator service manual

• Not interchangeable across actuator generations without part-number confirmation

  

🔌 Function

  

Closes the brake-fluid reservoir and limits contamination.

  

Common signs of wear or failure:

  

• Fluid or moisture enters around the component

• Seal or thread is damaged

• Hydraulic leakage is visible

• Component will not tighten or seat correctly

• Connector, pin or fitting shows heat or corrosion damage

  

🛠️ Installation & Safety

  

• Disconnect trailer power and relieve hydraulic pressure before service

• Use only clean compatible brake fluid and fittings

• Follow Hydrastar bleeding and wiring procedures

• Test normal braking and breakaway operation after repair

• Brake-system repairs should be completed by a competent technician

  

📦 Condition

  

• Genuine Dunbier Marine Products part

• Brand new

• Supplied as one hydrastar replacement reservoir filler cap - 32-7640

• Supplied in original or equivalent packaging

## Details

- **Price:** 31.0 AUD
- **Vendor:** Dunbier
- **Tags:** Dunbier Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 31.00 AUD | In stock |

## Images

- 7201 Dunbier Hydrastar Filler Cap # 32-7640 | Marine Trailer Part
- 7201 Dunbier Hydrastar Filler Cap # 32-7640 | Marine Trailer Part
- 7201 Dunbier Hydrastar Filler Cap # 32-7640 | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/7201-dunbier-hydrastar-filler-cap-32-7640)
> Updated: 2026-08-05