H3073 Mackay 1881 Dunbier Hydraulic Union Copper Gasket | Marine Trailer Part

🔧 Product Description

Mackay Hydraulic Brake Union Copper Sealing Washer – Part Number: H3073

A soft copper sealing washer used on compatible hydraulic brake-line and banjo-style connections. The washer deforms under tightening to seal the joint against high-pressure brake fluid.

⚙️ Key Features

• Soft copper construction
• Single-use crush sealing design
• Suitable for compatible hydraulic brake fittings
• Resists brake-fluid exposure
• Marine trailer service component

📏 Specifications

• Application: Hydraulic union or banjo connection
• Dunbier reference: 1881
• Inside diameter and thickness must match the fitting

🔄 Cross Reference & Related Parts

• Mackay: H3073
• Dunbier: 1881
• Braided brake lines: H3064 series
• Connector: H3074

🚤 Trailer Compatibility & Application

• Suitable only for fittings designed to seal with a copper washer
• Not used on flare-seat joints that seal metal-to-metal at the flare

🔌 Function

Forms a pressure-tight seal between the fitting faces.

⚠️ Common Signs of Failure

• Fluid leaks at the union
• Washer is flattened, scored or work-hardened
• Washer has been reused
• Incorrect washer diameter prevents proper seating
• Fitting face is damaged

🛠️ Installation & Safety

• Use a new washer whenever the joint is opened
• Clean both sealing faces
• Do not stack washers
• Tighten to the fitting specification
• Pressure-test and inspect for leaks

📦 Condition

• Brand new Mackay trailer component
• Supplied as one copper sealing washer
• Supplied in original or equivalent packaging