Final answer:
The plastic pipe and fittings used to connect regulator vents to remote vent terminations shall be PVC in accordance with PVC standards.
Step-by-step explanation:
The plastic pipe and fittings used to connect regulator vents to remote vent terminations shall be Polyvinyl Chloride (PVC) in accordance with PVC standards. PVC is a type of plastic commonly used in various applications due to its durability, chemical resistance, and affordability. The use of PVC for these connections ensures proper ventilation and safety in the system.