Description
McAlpine Shallow Shower Trap — 90mm — 70mm Height — 50mm Seal — ST90CPB-S-70
The McAlpine ST90CPB-S-70 is a premium shallow shower trap engineered for low-profile shower installations where under-floor clearance is restricted. At just 70mm overall height with a superior 50mm water seal and a high 34 litre/min flow rate, it delivers full performance without requiring deep sub-floor access. The polypropylene body is supplied with a removable 110mm chrome plated brass flange and all fittings for a complete installation. Fully compliant with BS EN 274-1:2002 and BS EN 274-2:2002.
⚠️ Check clearance before ordering. This trap requires 70mm of clearance beneath the shower tray. Confirm your sub-floor depth before purchasing. For installations with less than 70mm clearance, an ultra-low profile trap will be required.
Key Features
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70mm overall height — suitable for low-profile installations with restricted sub-floor depth
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50mm water seal — superior odour protection; exceeds the minimum 25mm seal requirement
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34 litres/min flow rate — high drainage performance; prevents water pooling
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90mm waste hole — fits standard shower trays with 90mm waste apertures
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1½" BSP thread — standard UK connection size
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Removable 110mm flange — chrome plated brass; easy cleaning and debris removal
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1½" solvent weld outlet — secure, leak-free connection to waste pipe
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Complete installation kit — 135° bend, BSP coupling nut, and 1½" universal connector included
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BS EN 274 compliant — tested to BS EN 274-1:2002 and BS EN 274-2:2002
Technical Specification
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Brand: McAlpine
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Model: ST90CPB-S-70
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SKU: ST90CPB-S-70
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EAN: 5036484043870
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Type: Shallow shower trap
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Waste hole diameter: 90mm
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Overall height: 70mm
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Under-tray clearance required: 70mm
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Water seal depth: 50mm
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Flow rate: 34 litres/min (tested under 15mm constant head, BS EN 274-2:2002)
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Thread size: 1½" BSP
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Outlet: 1½" solvent weld
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Flange diameter: 110mm (removable)
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Flange finish: Chrome plated brass
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Body material: Polypropylene
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Weight: 0.35kg
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Standards: BS EN 274-1:2002 & BS EN 274-2:2002
What’s Included
- McAlpine ST90CPB-S-70 shallow shower trap body
- 110mm chrome plated brass removable flange
- 135° bend
- BSP coupling nut
- 1½" universal connector
- Installation instructions
Suitable For
- Low-profile shower tray installations with restricted sub-floor depth
- Timber floor constructions and first-floor bathrooms with limited joist depth
- Bathroom renovations and retrofit projects with shallow under-floor clearance
- Wet room conversions with shallow floor build-ups
- Any installation requiring a 90mm waste hole trap with 70mm clearance
Coordinate Your Shower Installation
Frequently Asked Questions
What clearance does this trap require beneath the shower tray?
The McAlpine ST90CPB-S-70 has an overall height of 70mm and requires 70mm of clearance beneath the shower tray for the trap body. Measure the available depth between the underside of your shower tray and the floor (or top of the joist) before ordering. If you have less than 70mm available, you will need an ultra-low profile trap.
What size waste hole does this trap fit?
This trap is designed for shower trays with a 90mm waste hole and a 1½" BSP thread. This is the standard waste hole size for the majority of UK shower trays. Check your tray specification before ordering if you are unsure.
What is the water seal depth, and why does it matter?
The water seal depth is 50mm. The water seal is the depth of water retained in the trap that prevents sewer gases from entering the bathroom. The minimum required by UK building regulations is 25mm. A 50mm seal provides significantly better odour protection and is less likely to evaporate in infrequently used showers, making it the preferred choice for professional installations.
What is the flow rate of this trap?
The ST90CPB-S-70 has a tested flow rate of 34 litres per minute (tested under a 15mm constant head to BS EN 274-2:2002). This is a high flow rate for a shallow trap, ensuring rapid drainage and preventing water pooling even with power showers and high-flow shower heads.
What type of outlet connection does this trap use?
The outlet is 1½" solvent weld. This connects to standard 40mm (1½") solvent weld waste pipe. A 135° bend, BSP coupling nut, and 1½" universal connector are included to allow flexible pipe routing beneath the tray.
Is this trap BS EN 274 compliant?
Yes — the McAlpine ST90CPB-S-70 is fully compliant with BS EN 274-1:2002 (requirements) and BS EN 274-2:2002 (test methods). This is the relevant British and European standard for sanitary tapware and waste fittings, providing assurance of quality and performance.
Can I order if the item shows as out of stock?
Yes — this product is available to order even when stock shows as zero. Please allow additional lead time and contact us on 01603 381095 to confirm availability.
