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The correct choice is a check valve, which plays a crucial role in preventing backflow and backpressure in systems that include sump pumps and ejectors. A check valve allows fluid to flow in one direction only, ensuring that when the pump is not active, wastewater or water does not flow back into the sump or ejector pit. This is particularly important in drainage systems where the risk of backflow can lead to flooding or contamination, thereby protecting the integrity of the plumbing system and maintaining health and safety standards.

Other options such as a backwater valve can also control backflow but are primarily designed for use in sewer systems to prevent sewage from entering a building. Pressure valves serve different functions typically related to regulating system pressure rather than preventing backflow, while float valves are commonly used for maintaining water levels in tanks rather than being a mechanism for backflow prevention. Therefore, the check valve is the most appropriate and effective choice for protecting sumps and ejectors against backflow and backpressure.