McAlpine T31M Straight Male Threaded Adapter — 1.5″ BSP to 40mm-43mm Multifit

McAlpine T31M Straight Male Threaded Adapter — 1.5″ BSP to 40mm-43mm Multifit

Features

This genuine McAlpine T31M straight male threaded adapter provides a secure bridge between imperial threaded connections and metric plastic plumbing lines. It features a robust 1.5″ BSP male thread on one end. Consequently, it easily screws into standard female manifolds, pumps, or plumbing valves. The opposite socket contains a specialized internal Multifit rubber compression seal. Therefore, it accommodates domestic plain-ended waste pipes measuring anywhere between 40mm and 43mm. Because it relies entirely on physical compression, it creates a high-pressure, watertight joint without using messy glues or chemical welding compounds.

• Genuine McAlpine fitting delivers professional, trade-tested reliability
• Converts any standard 1.5″ female BSP thread into a waste pipe connection
• Universal Multifit socket seals tight over 40mm, 42mm, and 43mm pipes
• Fast mechanical compression assembly requires no specialized tools or glue
• Durable white polypropylene body handles chemical cleaners and boiling water
• Ideal for linking heavy-duty water pumps, valves, and manifold systems

Technical

• Brand: McAlpine
• Product Code: T31M
• Product Type: Straight Male BSP Threaded to Multifit Compression Adapter
• Thread Fitting Size: 1.5″ Male BSP (Measures approximately 48mm externally across the threads)
• Compression Size Compatibility: 40mm, 42mm, and 43mm Outer Diameter (OD) plain pipes
• Trade Size Profile: Standard UK 1.5″ Waste Plumbing Networks
• Material: Premium Polypropylene (White Plastic Body)
• Suitability: Connecting threaded pump housings, valves, or female equipment to drainage lines

Details

Connecting a mechanical component like a water pump or a female distribution manifold to standard plastic drainage runs frequently presents a difficult matching issue. For example, machine outlets utilize rigid imperial threaded ports. However, plastic household pipework uses smooth, unthreaded external walls. Furthermore, trying to solvent weld a connection directly onto mechanical threads is completely impossible. Because different domestic pipe brands vary slightly between 40mm and 43mm in size, using a standard single-size compression fitting usually results in a loose connection. Consequently, this causes dangerous leaks that spray pressurized water everywhere.

Fortunately, this genuine McAlpine T31M straight male threaded adapter resolves these physical conversion problems cleanly. On one side, the 1.5″ BSP male thread spins tightly into your machine’s female receiving port, creating a rock-solid foundation. Meanwhile, the opposite compression socket handles the smooth household line easily. Thanks to its multi-layered rubber gasket, it compresses uniformly around any pipe brand between 40mm and 43mm when hand-tightened. Thus, you do not need to identify your pipe type beforehand. Consequently, you achieve a dependable, watertight transition run without using toxic glues.