McAlpine STW5-R White High-Flow Shower Trap — 50mm Hole with 85mm Flange

McAlpine STW5-R White High-Flow Shower Trap — 50mm Hole with 85mm Flange

Features

This genuine McAlpine shower trap is a premium, compact drainage system engineered specifically for shower trays with a standard 50mm waste hole. Bearing the manufacturer part number STW5-R, it is distinguished by an oversized white 85mm top flange, offering broader cosmetic coverage across the bottom of your enclosure. Designed to slide easily into tight floor voids, the body features a shallow 95mm under-tray height alongside a space-saving 19mm water seal. Despite its ultra-compact shape, it utilizes advanced internal channels to pump out a fast 50 litres of water per minute, keeping high-pressure showers running flawlessly without pooling.

• Genuine McAlpine professional plumbing hardware proudly manufactured in the UK
• Oversized white 85mm top flange provides enhanced tray hole coverage
• Massive 50 litres per minute flow rate eliminates slow-draining water pooling
• Designed specifically for shower trays with a standard 50mm waste hole
• Compact 95mm under-tray height fits into narrow structural floor voids
• Versatile 1.5″ universal compression outlet ensures a reliable, leak-free pipe connection
• Removable waste grid and internal dip tube allow fast cleaning from above
• Manufactured from heavy-duty polypropylene to resist harsh chemical cleaners

Technical

• Brand: McAlpine
• Part Number: STW5-R
• Tray Hole Compatibility: 50mm Diameter Waste Hole (1.5″ Standard)
• Top Flange Diameter: 85mm (Oversized Base)
• Top Flange Finish: White Plastic
• Overall Under-Tray Height: 95mm
• Water Seal Depth: 19mm (Shallow Run)
• Outlet Connection: 1.5″ Universal Compression Coupling
• Flow Rate: 50 Litres per Minute (Tested under constant 120mm head)
• Material: High-Impact Polypropylene
• Certification: Conforms to BS EN 274-2:2002 (Clause 5)

Details

Installing a weak or narrow-flanged universal trap under a 50mm shower hole is a major headache. Consequently, sub-standard generic fittings can restrict water drainage, leaving you standing ankle-deep in dirty water. Therefore, standing water constantly threatens your enclosure’s silicone seals. Furthermore, if a cheap plastic body splits inside an inaccessible floor void, it leads to hidden dampness. As a result, this tracking water rots timber joists and ruins downstairs plaster ceilings, causing thousands in structural repair costs.

Fortunately, installing this authentic McAlpine shower trap solves these flow and structural leak anxieties completely. Specifically, the wide 85mm white top flange overlaps the tray opening beautifully, ensuring a solid mechanical clamp. Additionally, the premium British-engineered polypropylene housing handles hot water expansion and chemical cleanings without ever cracking. Therefore, you get an exceptionally durable, fast-flowing, and permanently watertight installation that protects your home.