Which method is most effective for preventing leaks at joints in a pipe?

The effectiveness of preventing leaks at joints in a pipe heavily relies on the quality of materials and techniques employed during installation. The use of high-quality fittings combined with proper sealing methods is crucial, as it ensures that the joints are adequately sealed and can withstand pressure and environmental factors over time. High-quality fittings are designed to fit precisely and provide a reliable connection, reducing the risk of failure at the joint.

Additionally, employing proper sealing methods, such as using appropriate sealants or gaskets, helps create a watertight seal, further preventing leaks. This proactive approach addresses the common points of weakness in pipe systems, which tend to be at the joints where fittings are used.

In contrast, using any type of glue lacks the specificity and durability required for effective sealing, while minimizing the number of fittings might not address the inherent risks of the fittings used or the joints formed. Reducing the pipe diameter doesn't directly relate to joint integrity but could introduce further complications in flow and pressure. Thus, the combination of high-quality materials and sound sealing practices is essential for maintaining leak-free installations.