The gas pipework can be separated in to 2 categories. The first would be the pipework that is external to the appliance and is connected to the wall jig which allows an influx of gas. The second category would be any pipework within the unit that transports the gas between the different components within the boiler that require it.
Fits multiple appliances
Technical specification
Toilet Cistern CapacityFTW--Supplier Part NumberSP988036