VAILLANT SUSTAIN 825 830 & 835 BOILER AUTO AIR VENT 104521
Will fit: VAILLANT SUSTAIN 825 BOILER. VAILLANT SUSTAIN 830 BOILER. VAILLANT SUSTAIN 835 BOILER. Products will not be covered if misused or not serviced as per maintenance instructions. Nagi House, Alperton Lane, Wembley, HA0 1DX.