A filling loop is a component used to fill and pressurize a closed heating system, such as a boiler or central heating system. It allows water to be added to the system and helps to maintain the correct pressure for efficient and safe operation. This part is present 10 different boilers in the Grant range including the Grant Vortex Pro Condensing Kitchen 15/21, Vortex Pro Condensing Kitchen 26/36, Vortex Pro Condensing Kitchen 36/46, Vortex Pro Condensing Kitchen 46/58. The hose on this VBS35 filling loop is 810mm (81cm)