What connects the steam and water spaces of a cast iron sectional boiler?

In a cast iron sectional boiler, the steam and water spaces are connected through the use of push nipples or gaskets. These components serve as the joints that create the necessary passage between the steam and water sections while maintaining a seal to prevent leaks.

Push nipples, which are essentially designed to withstand high pressures and temperatures found in boilers, allow for the efficient transfer of steam and water within the boiler system. Additionally, gaskets help to ensure that a tight seal is maintained around these connections, preventing any loss of pressure or fluid, which is critical for the proper operation of the boiler.

The correct answer emphasizes the function of these connections in maintaining the integrity and efficiency of the boiler system, highlighting their importance in the overall design and operational capacity of cast iron sectional boilers.