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The McAlpine STW4-M 50mm water seal resealing shower trap is an essential plumbing component for homeowners and contractors seeking a reliable drainage solution for showers and wet rooms. It excels at preventing foul odors from entering the bathroom through an automated resealing mechanism that stays active during periods of inactivity. While its compact and universal design makes installation highly versatile across various waste pipe configurations, users should ensure adequate space beneath the shower tray to accommodate the 50mm seal depth and the included 95-degree bend.
| Model Part Number | STW4-M |
|---|---|
| Brand | McAlpine |
It features a 1.5-inch multifit outlet designed to connect to standard plumbing waste pipe sizes.
Yes, it is a 50mm water seal trap designed to prevent sewer gases from entering your home.
Yes, it is designed for use in both standard showers and wet room drainage configurations.
The bend is fixed at 95 degrees, but the coupling nut allows for rotational adjustment during installation.
Cleaning frequency depends on usage; however, it is recommended to inspect and clean it every 6-12 months to maintain optimal flow.
Remove the access cap and clear any hair or soap buildup from the internal chamber.
Check that the trap has been correctly installed and that the water seal has not evaporated; ensure all connections are airtight.
Ensure the washer is correctly seated within the coupling nut and re-tighten the connection firmly.
Before installation, ensure that the waste outlet on your shower tray is compatible with the 1.5-inch BSP thread. When installing, tighten the coupling nuts by hand, followed by a light turn with an appropriate wrench to ensure a watertight seal without cracking the plastic components. To clean the trap, simply unscrew the access cap to clear any trapped hair or debris. Avoid using harsh chemical drain cleaners, as these can damage the internal components of the trap over time. Periodically inspect the connections for any signs of moisture to ensure the seals remain intact.
