Slip joint compression type waste line connections shall be:

Slip joint compression type waste line connections are designed to provide a flexible and serviceable connection. The requirement that these connections be accessible for inspection and repair is crucial because it ensures that any potential issues, such as leaks or blockages, can be easily identified and addressed. Accessibility plays a significant role in maintaining the overall plumbing system's functionality without the need for extensive disassembly or demolition, which could lead to increased repair costs and time.

In environments where plumbing systems may be subject to wear and tear or where maintenance is necessary, ensuring that these connections are accessible means that plumbing professionals can perform routine checks and necessary repairs promptly. This proactive maintenance helps prevent more severe plumbing failures, ensuring the integrity of the system as a whole.

While being exposed, lubricated, or insulated might have their merits in specific contexts, those factors do not directly address the critical need for ease of access during inspections or repairs, which is the primary reasoning behind the accessibility requirement in plumbing codes.