Final answer:
Vacuum breakers prevent back-suction, cross-connections need protection, and wastewater inhibitors maintain water safety.
Explanation:
Vacuum breakers are necessary in plumbing connections to prevent back-suction, maintaining water quality and preventing contamination. They work by allowing air to enter the system, breaking the vacuum created by water flow.
Cross-connections between two-threaded faucets are safeguarded by approved vacuum breakers to ensure water flows in the right direction and prevent contamination.
Having a wastewater inhibitor is important to prevent wastewater entering the main water supply, keeping the water clean and safe for use.
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