McAlpine ARB‑1 Anti‑Rodent / Anti‑Backflow Barrier Valve for WC Connectors

The McAlpine ARB‑1 is a polypropylene anti‑crossflow and rodent barrier valve designed to fit 4″ (110 mm) WC connector outlets. It blocks rodents and prevents backflow in toilet installations, ideal for back‑to‑back pans in both domestic and commercial applications 

Key Features:

• Compatible with any McAlpine rigid or flexible WC connector featuring a 4″/110 mm rubber outlet seal

• Manufactured in black polypropylene to prevent light penetration 

• Door supported by stainless‑steel mesh to resist rodent gnawing

• Effective both horizontally and vertically 

• Complies with Approved Document H1 (Building Regs 2000) and BS EN 12056‑2:2000 plumbing standards 

Benefits:

• Prevents sewer gases, liquid backflow, and rodent entry from soil pipes

• Ideal protection for shared wall installations or connected systems

• Stainless‑steel mesh flap resists rodent damage and ensures reliable sealing

• Simple, tool-free push-fit installation onto existing WC connectors

Applications:

• Back‑to‑back toilet installations in flats, hotels, restrooms, and any shared plumbing setups

• Compliance with rodent control and sanitary standards in building regulations

• Suitable for both new constructions and refurbishments requiring anti‑rodent measures

Conclusion:
The McAlpine ARB‑1 offers effective and compliant protection against rodent intrusion and backflow in WC installations using 110 mm outlet connectors. Its durable build, easy installation, and adherence to regulations make it an essential barrier device for both residential and commercial plumbing systems.

At GetPlumb, we strive to provide reliable and cost-effective delivery options to our customers. Please review our shipping policy below.

🆓 Free Local Delivery (Orders £100 & above)

We offer FREE delivery on orders £100 or more
for selected local areas.

Eligible Postcodes Include:

• RG*
• SL*
• OX10*, OX11*, OX49*
• HP1*, HP3*, HP8*, HP9*, HP10*, HP11*, HP12*, HP13*, HP14*
• WD*, HA*, UB*, TW*, KT*
• W1* – W9*
• NW*, SW*

Delivery Time: 2–4 working days

Shipping Cost: £0.00

📦 Standard Shipping (Weight-Based Rates)

For orders that do not qualify for free delivery, standard
shipping rates apply based on total cart weight.

• For cart weight between 0–2 kg, the shipping cost is £4.50 with a delivery time of 2–4 working days.
• For cart weight between 2–24 kg, the shipping cost is £9.99 with a delivery time of 2–4 working days.
• For cart weight between 24 kg and above, the shipping cost is £60 with a delivery time of 2–4 working days.

🧱 Block Salt (Harvey’s) – Unit-Based Shipping

This rate applies only to Harvey’s block salt products.

• £7.99 is charged for every 3 items.
• The charge increases by £7.99 for each additional set of 3 items.

Examples:

• 1–3 items → £7.99
• 4–6 items → £15.98
• 7–9 items → £23.97

Delivery Time: 2–4 working days

📏 Large / Long Items (Length-Based Shipping)

For oversized items where the product length is 1.5 metres or more:

Conditions:

• Product length ≥ 1.5 m
• Cart weight ≤ 40 kg

Shipping Cost: £18.00 (flat rate)

Delivery Time: 2–4 working days

Collection from Store

Customers can also choose to collect their order from our store in
Reading, UK, at no additional charge. For any questions regarding shipping, please contact our support team at online@getplumb.co.uk.