Glow-worm 0020186165 hydroblock

This Glow-worm brand hydroblock is suitable for use in the brand's Betcom 3, Betacom 4, Energy, Energy 7, Essential, Home, Easicom 2, Easicom 3, Sustain, Ultimate 2 and Ultimate 3 boilers. Located at the bottom of a boiler and normally connected to the diverter valve, pump and heat exchanger, the hydraulic block assists in the transfer of hot and cold water around the appliance.