What must be provided for slip-joint connections?

For slip-joint connections, access is essential because these types of joints rely on a sliding pipe fitting that can be adjusted or expanded. Proper access allows for easy inspection, maintenance, and potential adjustment of the connection should any leaks develop or if there is a need for realignment.

In plumbing systems, slip-joint connections may need to be accessed for routine checks or repairs. If these connections are hidden behind walls or in places without access, it can lead to more significant issues down the line if a leakage occurs, as they could become difficult to service without considerable effort or expense to reach them.

The other options, such as maintenance access and sealing material, might be important but not as crucial as having the ability to access the joint itself, particularly since the primary feature of a slip-joint connection is its ability to slide and adjust. Therefore, providing access is the key requirement for these connections.