A single slip joint connection with an elastomeric gasket is permitted on the outlet side of which plumbing component?

A single slip joint connection with an elastomeric gasket is permitted on the outlet side of a 1 1/2" trap because this size aligns with plumbing code regulations regarding drain and waste installations. The elastomeric gasket provides a reliable seal that accommodates slight movements without losing its integrity, which is important in this application to prevent leaks and facilitate maintenance.

In contrast, larger trap sizes, such as 2" or 3", typically require more rigid connections and less flexibility to ensure structural support and proper flow characteristics in waste drainage systems. Moreover, the 1" trap is generally not commonly used in residential plumbing applications where a slip joint connection would be more suited for larger traps like the 1 1/2" size. The 1 1/2" trap is the standard for most plumbing installations, making it the suitable choice for the specified connection type.