During installation, the fittings should be carefully checked to avoid____________.

The correct choice encompasses all the potential issues that can arise during fitting installation, making it crucial to check for each of them. Ensuring that fittings are properly installed prevents a range of complications that could affect the performance and safety of the system.

For instance, PVC cement mishaps can lead to weak joints if excess cement is used, or if the cement is applied incorrectly, leading to potential leaks or failure. Overly tight connections can create stress points in the material, which may result in damage or a complete failure of the connection due to cracking or splitting. Improper angles can affect the flow and efficiency of the system, causing unnecessary pressure build-up and reducing the overall effectiveness of the installation.

By verifying all these factors, one can ensure that the installation is conducted correctly and that the fittings will function optimally within the system, thereby enhancing its longevity and reliability. Hence, acknowledging all these concerns collectively contributes to a successful installation process.