What is commonly used to seal connections in PVC piping systems?

PVC cement is commonly used to seal connections in PVC piping systems because it creates a chemical bond between the surfaces of the PVC pipes and fittings, ensuring a strong and durable seal. This bonding process involves softening the PVC material, allowing the cement to penetrate and fuse the pieces together as it cures. The result is a watertight and air-tight connection that can withstand the pressure and environmental conditions typical in plumbing and other applications.

In comparison, silicone sealant is not specifically formulated for PVC and may not provide the same level of strength or durability required for permanent joints in piping systems. Electrical tape is designed for insulating electrical connections and does not offer the robustness needed for plumbing applications. Pipe joint compound is typically used with threaded connections in metal piping systems, not for fusion joints between PVC components. Thus, PVC cement is the appropriate choice for sealing connections in PVC piping systems.