Repairing a PVC joint leak involves a few steps to ensure a watertight seal. Firstly, turn off the water supply and drain the system. Clean the leaking area thoroughly. For small leaks, a PVC joint compound or sealant can be applied directly to the area. Allow it to dry based on the product instructions. For larger leaks or damages, cutting out the damaged section and replacing it with a new piece using PVC couplings and PVC solvent cement is recommended. Ensure all connections are secure and give ample time for the cement to cure before turning the water back on. Always follow safety instructions when handling PVC primer and cement. Regular maintenance and inspection can prevent leaks from developing.

To identify polyethylene (PE) or polypropylene (PP) plastics, begin with a simple floating test since PE and PP are lighter than water and will float. Additionally, observe the plastic's appearance and texture: PE feels softer and more pliable, while PP is harder and more rigid. Another method is the burning test, albeit with caution. When burned, PE drips and burns with a blue flame, producing a paraffin-like smell, whereas PP also drips, burns more steadily, and emits a scent similar to that of an oil lamp. It's important to conduct these tests in a well-ventilated area or under professional guidance to avoid inhaling toxic fumes. Manufacturers also use the Resin Identification Code (RIC) system, where PE is marked with a "2" (HDPE) or "4" (LDPE), and PP is marked with a "5". This coding system can be a quick identifier if it's present on the plastic material.

Using plumbing PVC for electrical conduit is not recommended or compliant with electrical codes like the National Electrical Code (NEC) in the United States. Plumbing PVC differs in composition and lacks the required features for safe electrical installations, such as resistance to sunlight (UV rays) and certain mechanical properties. Electrical conduit PVC is specifically designed to protect wires from external elements and hazards, including UV resistance and extra durability for physical impacts. Using the wrong type of PVC could lead to conduit degradation, exposing wires to potential damage, and creating fire hazards or electrical malfunctions. Always use materials designated for electrical use to ensure safety and code compliance.