In PVC plumbing, threaded connections offer advantages in specific scenarios, particularly for creating reliable, low-pressure connections and allowing for disassembly and repair. Non-threaded connections, often made with solvent cement or heat fusion, excel in creating strong, permanent, and leak-proof joints.  Here's a more detailed breakdown:  Threaded PVC Connections:  Pros:   Ease of Installation:  Threaded fittings are relatively easy to install, often requiring only hand tools and no specialised skills or equipment.  Disassembly and Reassembly:  Threaded connections allow for easy disassembly and component replacement, which is useful for repairs or modifications.  Leakage Integrity:  Threaded fittings can provide good leakage integrity in low-pressure systems, especially when combined with thread sealant.  Cons: Potential for Leaks:  If not properly installed or sealed, threaded connections can be prone to leaks, e...