Caleffi A311501CST Loose Nut 6 Bar Pressure Relief Valve for MK2 Multibloc Unvented Cylinder Systems
Caleffi A311501CST Pressure Relief Valve with 6 Bar rating and loose nut fitting—a direct replacement for MK2 Multiblocs in unvented hot water systems.
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- Estimated Delivery: For most items (over 99% of our products), orders placed before 3pm on working days will be dispatched the same day with our Fast DELIVERY 1st class service. For the rare items not immediately in stock, dispatch may take 1-3 working days after receiving your order. If your order cannot be dispatched the same day, we will notify you via email.
- For boilers: We aim to dispatch on the next working day. However, in some cases, it may take 2-3 working days to dispatch. Rest assured, we will always strive for the fastest possible turnaround.
The Caleffi A311501CST Loose Nut Pressure Relief Valve is engineered to maintain safe pressure levels in unvented hot water systems. Specifically designed for MK2 Caleffi Multiblocs, this 6 Bar-rated valve provides dependable overpressure protection, ensuring consistent operation and compliance with modern plumbing standards.
Featuring a loose nut connection, this valve installs easily into your existing system without requiring extensive modifications. It’s an ideal solution for replacing a failed relief valve while retaining your original multibloc, making it both cost-effective and practical for routine maintenance.
Whether you’re managing a residential installation or performing service work on a pressurized cylinder system, the A311501CST delivers long-lasting performance backed by Caleffi’s trusted engineering.
Key Features
• 6 Bar Pressure Rating – Factory-calibrated for overpressure safety in sealed hot water systems
• Loose Nut Connection – Allows for quick and secure integration into MK2 multiblocs
• Compatible with MK2 Multibloc – Tailored fit for second-generation Caleffi inlet valve assemblies
• Robust and Reliable Build – Designed for long-term use in residential unvented cylinder systems
• Cost-Effective Maintenance – Replace only the failed relief component, not the entire unit
Applications
• MK2 Multibloc Repair – Restore safe operation by replacing the dedicated pressure relief valve
• Unvented Hot Water Cylinder Systems – Maintain safety and performance standards
• Routine Maintenance – Ideal for plumbers and service engineers needing fast replacement options
Technical Specifications:
| Feature | Details |
|---|---|
| Brand | Caleffi |
| Product Code | A311501CST |
| Pressure Rating | 6 Bar |
| Connection Type | Loose Nut |
| Compatibility | MK2 Caleffi Multibloc |
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