Would this work with very low water pressure

This device fits in the waste pipe after the toilet pan and is only reliant on the water flushing from the pan to open then the spring hinge closes it. As the water is gravity fed from the pan it makes no difference whether you have low or high water pressure. The only factor is whether your cistern delivers a 7 or 10 litre flush and the amount of waste being flushed. A consideration in fitting the device is that if the drain backs up with effluent then the device is forced closed and the toilet pan will not empty when flushed but this would happen anyway but the device can stop overflow effluent from coming into your pan from elsewhere if your toilet is at low level compared to others on the same drains

Need one of these for 3" down pipes... Will this fit?

It's for a 4" waste pipe. Replaces the seal on a toilet pan connector.

Does this trap fit externally or internally to the existing outlet? My outlet is flush to the wall of access pit so would need to be an internal fit,

Hi there, this is designed to fit in place of the existing rubber fin seal on the end of many WC pan connectors, It can however fit inside a 110mm pushfit or solvent pipe or fitting wit a decent seal, although please check regs and practicality of your installation, Regards esda-supplies

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🚫🐭 Keep your plumbing flawless and rodent-free—because your space deserves the best!

RODENT DEFENSE SYSTEM - Built-in barrier deters rodents from invading your space—peace of mind included.
VERSATILE INSTALLATION - Seamlessly installs horizontally or vertically to fit your unique plumbing setup.
UNIVERSAL COMPATIBILITY - Works flawlessly with any McAlpine 4"/110mm WC connector, rigid or flexible.
ZERO CROSS FLOW GUARANTEE - Prevents back-to-back WC pan cross contamination with precision engineering.
CERTIFIED QUALITY ASSURANCE - BS EN 12056-2:2000, CE, and RoHS certified for trusted, professional-grade performance.

The McAlpine ARB-1 Anti Cross-Flow and Rodent Barrier Valve is a compact, black rubber valve designed to prevent cross-flow between back-to-back WC pans and block rodent entry. Certified to BS EN 12056-2:2000, CE, and RoHS standards, it installs easily in both horizontal and vertical orientations and fits any McAlpine 4"/110mm WC connector, ensuring reliable, professional-grade plumbing protection.

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Manufacturer	McAlpine
Part Number	ARB-1
Product Dimensions	6.4 x 11.3 x 11.3 cm; 100 g
Item model number	ARB-1
Colour	Black
Material	Rubber
Item Package Quantity	1
Number of Pieces	1
Measurement System	Metric
Certification	BS EN 12056-2:2000, CE, RoHS
Included Components	1 x valve
Batteries included?	No
Batteries Required?	No
Item Weight	100 g

McalpineARB-1 Anti Cross-Flow and Rodent Barrier Valve, Black

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