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The McAlpine STW4-RB Shower Trap is designed for homeowners and plumbers seeking an effective solution to prevent sewer gases and unpleasant odors from entering living spaces via shower plumbing. Its primary benefit is the reliable 50mm water seal and resealing mechanism, ensuring a hygienic environment. A potential caveat is the need for proper installation to guarantee the multifit outlet seals effectively. This guide covers its key features, performance, setup, and maintenance.
| Model Part Number | STW4-RB |
|---|---|
| Brand | McAlpine |
A resealing shower trap, like the McAlpine STW4-RB, prevents unpleasant sewer gases and odors from entering your home through the shower drain by maintaining a water seal, even when the shower isn't in use.
Multifit outlet means the trap's outlet is designed to accept a range of different pipe diameters and types (e.g., push-fit or solvent weld), offering flexibility during installation without needing special adaptors.
You can easily clean the trap by lifting out the removable top and silicone seal. Wipe them clean with a damp cloth and rinse before reinserting.
This trap is specifically designed for shower trays with a 50mm waste hole. Ensure your tray has this size opening for a correct fit.
The McAlpine STW4-RB features a 50mm water seal, which is a standard and effective depth for preventing gases.
The STW4-RB typically comes with the trap body, the resealing mechanism (top and silicone seal), and a 95° bend with a BSP coupling nut.
While the principle of odor prevention is the same, this trap is specifically designed for shower waste and trays. Using it for other applications like kitchen sinks may not be appropriate due to flow rates and debris.
Ensure the water seal is present. If the shower is used infrequently, run water for 30 seconds daily. Check that the resealing mechanism is clean and functioning correctly. Verify all pipe connections are sealed and airtight.
The trap may be clogged. Remove the top and seal, then clean out any hair, soap scum, or debris. Check the 95° bend and subsequent pipework for blockages.
Ensure the pipe is pushed fully into the multifit socket. If using solvent weld, ensure the pipe is properly prepared and cemented. For push-fit, ensure the pipe is clean and undamaged. Consider using appropriate sealing tape or lubricant if needed.
The silicone seal may be damaged or misaligned. Remove, clean, and re-seat the silicone seal carefully. If damaged, the seal may need replacement.
Setup:
Compatibility:
Care:
