Which fittings are known as "(running traps/house traps)"?

Running traps, often referred to as house traps, are designed to prevent sewer gases from entering the building while allowing wastewater to flow through. These fittings maintain a water seal and are typically installed in the drainage system of a house.

In the context of the choices provided, the fittings categorized as running traps are most accurately represented by the first and fourth options. These fittings serve the purpose of trapping sewage gases and ensuring that only liquids can pass through.

This combination of fittings being identified as running traps demonstrates their function in maintaining the health and safety of the plumbing system within residential buildings. It is essential for plumbing professionals to correctly identify these components, as they play a crucial role in waste disposal and odor prevention. Understanding the function and appropriate application of running traps is vital for maintaining effective plumbing systems.