---Designed for easy connection to pressurized system boilers, this 15mm central heating fill loop helps top up water levels efficiently, making it an essential part for regular maintenance and system balance. ---Features a double check valve to prevent backflow into the mains, ensuring your heating system operates safely and stays compliant with plumbing regulations in residential and commercial environments. ---Built with standard 15mm compression fittings, this filling loop connects easily to most domestic heating systems, eliminating the need for specialized tools or components during installation. ---Manufactured using durable, corrosion-resistant materials that support long-term performance under high pressure and fluctuating temperature conditions commonly found in central heating systems.