McAlpine STW70LN White Shower Waste Locking Nut — 70mm Replacement Flange

McAlpine STW70LN White Shower Waste Locking Nut — 70mm Replacement Flange

Features

This genuine McAlpine shower waste locking nut is a professional replacement flange designed to secure and seal standard under-tray trap bodies. Bearing the part number STW70LN, this 70mm diameter white ABS component features a standard 1.5-inch BSP threaded tail (measuring approximately 48mm outer diameter) that screws directly into your trap housing from above. It is engineered to accommodate standard shower trays with a maximum thickness of 22mm. Designed without a built-in grid, this open locking ring serves as the critical structural clamping mechanism that compresses your waste washers against the tray floor to prevent leaks.

• Genuine McAlpine British spare part ensures a precise factory-standard fit
• Durable white ABS construction resists heavy impacts and chemical cleaners
• Standard 1.5″ BSP thread screws directly into underlying McAlpine traps
• Designed for standard shower trays up to a maximum thickness of 22mm
• Provides a tight mechanical clamp to ensure a completely watertight seal
• Cost-effective fix replaces a cracked locking nut without replacing the whole trap

Technical

• Brand: McAlpine
• Part Number: STW70LN
• Product Type: Replacement Shower Waste Locking Nut / Flange
• Flange Diameter: 70mm
• Maximum Tray Thickness Compatibility: 22mm (Standard)
• Thread Size: 1.5″ BSP (Measures ~48mm outer diameter)
• Finish: Clean White
• Material: High-Impact ABS Plastic
• Compatibility: Fits McAlpine and standard 1.5″ threaded under-tray shower traps

Details

Over-tightening a shower waste during installation or using harsh chemical cleaners over time can cause plastic locking nuts to stress-crack. Consequently, the mechanical clamp holding the trap against the underside of the tray fails, creating a slow, tracking leak into hidden floor voids. Furthermore, homeowners often assume that fixing a leaking or broken internal collar requires a plumber to tear out the entire under-tray pipework. As a result, they risk major water damage, ruined ceilings below, and high repair bills.

Fortunately, threading in this authentic McAlpine shower waste locking nut completely solves this structural leak risk. Specifically, the standard 1.5″ threaded tail allows you to simply unscrew your cracked or worn flange from inside the tray and twist this fresh one straight into place from above. Additionally, the high-grade ABS body creates a reliable, flat mechanical clamp against your sealing washers. Therefore, you get an instant, tool-free repair that restores a permanently watertight seal to your shower drain.