Premium Brass Compression Straight Couplings | 8mm to 54mm

Achieve a flawless, high-pressure line connection with our Premium Brass Compression Straight Couplings. Engineered to join two sections of standard copper tubing inline, these fittings deliver an ultra-secure mechanical joint without the need for specialized tools, soldering, or open flames.

From low-profile domestic plumbing repairs to large-scale commercial installations, our comprehensive size range has you covered. Whether you are dealing with microbore 8mm lines for heating systems or heavy-duty 54mm main supply lines, these fittings provide the structurally sound, leak-proof performance that professional installers rely on.

Key Features

• Solid Forged Brass Construction: Manufactured from high-grade, corrosion-resistant brass to withstand high mechanical stress and long-term water exposure.

• Flame-Free Installation: Creates a robust mechanical seal solely through tightening nuts; perfect for working in confined spaces, close to woodwork, or on damp lines where soldering is impossible.

• Complete Size Range: Available in nine precision-engineered metric sizes (8mm up to 54mm) to fit microbore heating, domestic hot/cold water, and industrial pipework.

• High-Grip Internal Olives: Pre-equipped with premium compression rings that compress evenly against copper piping to create an immediate, watertight barrier.

Plumbing Benefits

• Durable & Dependable Joint: Designed to withstand standard residential and commercial system pressures, reducing the risk of costly call-outs or line failures.

• Saves On-Site Time: Eliminates the preparation, flush-cleaning, and cooling cycles required by heat-bonded capillary fittings, accelerating your project timeline.

• Reusable and Adjustable: The mechanical design can be isolated, undone, and remade during future system modifications or maintenance drain-downs.

• Universal System Compatibility: Ideal for multi-tier applications including domestic drinking water, closed-loop central heating, and gas installations.

Available Sizes & Specifications

Select your required outer diameter (OD) configuration from the dropdown selection box: