Which type of floor urinal does not have an integral trap?

The correct answer is the floor set urinal, which typically does not feature an integral trap as part of its design. Floor set urinals are directly installed onto the floor and rely on an external drain system to manage waste. Unlike some other urinals that may be designed with built-in traps to contain odors and facilitate drainage, a floor set relies solely on the plumbing configuration in place.

In contrast, blow out urinals are designed to utilize a higher volume of water to ensure effective flushing, which can sometimes incorporate an integral trap. Pedestal urinals, while having a somewhat elevated design, often include an integral trap as part of their structure to maintain a neat and functional connection to the plumbing system. Wall-mounted urinals are secured to the wall and typically include an integral trap for a compact design, keeping the plumbing concealed and minimizing odors.

Thus, the floor set urinal is specifically characterized by the absence of an integral trap, making it a distinct choice among the options listed.