The PlumbEZ WRAS Approved Boiler Filling Loop (15mm) is designed for topping up sealed central heating systems on combi boilers. It provides a controlled way to refill the system when pressure drops, helping keep your heating running efficiently and reliably.
This filling loop is WRAS approved and Part L compliant, making it suitable for modern heating installations. It includes a double check valve to help prevent backflow, an isolation valve for easy control, and end caps for a neat, secure finish when the hose is not in use.
Key features
- 15mm connection – common size for combi boiler filling loops
- WRAS approved for water safety standards
- Part L compliant – suitable for current building regulation requirements
- Double check valve to help prevent backflow/contamination risk
- Isolation valve for straightforward shut-off and maintenance
- End caps included for added protection and a tidy install
Typical uses
- Topping up pressure on sealed central heating systems
- Combi boiler refill / boiler top-up hose replacement
- Heating system maintenance and upgrades
Installation notes
- Fit only where appropriate for your boiler/system design.
- After topping up, close the isolation valve and refit end caps.
- Always follow manufacturer instructions and local regulations.



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