Altecnic WRAS Filling Loop Altecnic Filling Loops are used to fill sealed systems from the mains cold water. They are approved flexible hoses complete with check valves, comply with water regulations and use WRAS approved components. Features and Benefits: Altecnic Filling Loop Ecofil Plus Filling Loop (G24 Approved) with Caps and Collars Complete with Check Valves Which Comply with Water Regulations WRAS Approved Manufacturer Guarantee