The end plates shall comply with Regulation 408 or 412 according as they are dished or flat. When end plates are mechanically secured and welded to seamless shells as in earlier figure47 and 48 and the weld are stress-relieved, the pressure and other limitations specified in respect of Class II boilers in Regulation 416 shall not apply.

These shall comply with Regulation 407.

Mountings, fittings and connections shall comply with Regulation 281.

In the case of electrode boilers one means of indicating water level of the tubular water level gauge-glass type and one means of feeding the boiler shall suffice and the Safety Valves shall be of spring loaded type.

If an Electrode boiler is fitted with a magnetic valve, the said valve will be accepted in lieu of the second safety valve, provided the source of power supply to both the valve and the boiler is the same and both are operated by one single switch.