BSP 1/2" Brass Compression Pipe Fittings — Union, Elbow & Tee Connector

Choose Straight (Union) for joining two pipes in a straight line, Elbow for changing direction by 90°, and T Piece for splitting or branching a line into two directions. Sketch your pipe layout first to identify which shape — and how many — you need before ordering.

These fittings are sized for BSP 1/2" (nominally 20mm) pipe. In practice, always verify your pipe's outer diameter against the fitting's compression nut bore. BSP nominal sizes refer to bore diameter, not outer diameter, so measuring your actual pipe OD is the most reliable approach.

Brass generally offers good corrosion resistance for above-ground outdoor plumbing in most climates. For underground installations or highly corrosive environments (e.g., acidic soil, salt air), additional protection or alternative materials may be advisable. Contact us to confirm suitability for your specific conditions.

These fittings use BSP (British Standard Pipe) threads, which are widely used in plumbing systems across the UK, Australia, Asia, and many other regions. BSP threads are not directly compatible with NPT (US National Pipe Thread) threads — the thread angle and pitch differ. An adapter is required if connecting to NPT-threaded components.

No soldering is required. Compression fittings typically use a compression nut and olive (ferrule) to create a leak-resistant mechanical seal. In most cases, only an adjustable wrench or two open-end wrenches are needed. Avoid over-tightening, which can deform the olive and cause leaks.

Brass compression fittings in this size range are typically rated for residential and light commercial water and gas pressures. Exact pressure ratings vary by sub-type (A25–A33). Please contact us to confirm the rated working pressure for your specific variant before use in high-pressure applications.

The type codes (A25–A33) denote specific sub-configurations within each shape category — such as different end connection styles, port arrangements, or dimensional variants. Select your model (Straight, Elbow, or T Piece) first, then choose the type code that matches your application. If you're unsure, contact us with your pipe OD and connection requirements and we'll help you identify the right sub-type.