The Ideal gas valve kit classic is employed in the distribution of gas. The printed circuit board delivers a signal to the gas valve, which opens to let gas flow into the burner or the pilot assembly when gas is needed in the burner. Boiler spare parts must be fitted by a certified Gas Safe engineer. Ideal Boilers Ideal Domestic 171441 Gas Valve Kit Classic. Part No. 171441. Honeywell Part No. VR4601A A1036.