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No, they are two different things. Some tanks have a pressure relief valve built in. The purpose of this valve is to prevent the rupturing of the water heater due to pressure generated during the heating process. An expansion tank redirects water from the heater tank to relieve pressure so while they have the same purpose—alleviating pressure—the expansion tank is the only item actually redirecting water. 

PEX pipe is safe for drinking water, though it wasn't always. PEX was introduced in European water supply systems in the 1980s, but early versions of the piping deteriorated when exposed to the higher chlorine levels in U.S. water supplies. Antioxidants were added to PEX piping to meet U.S. potable drinking water standards. Today, it’s commonly used for drinking water.

Although air in your water lines won’t affect the overall quality of your water, it will lead to problems with your well water system if not addressed. Over time, too much air in your water lines can create blockages in your pipes, cause insufficient water flow to your taps and appliances, loosen pipes, and potentially damage important components of your well including your well pump and pressure tank. 

It is generally recommended to schedule a professional plumbing inspection annually, though an inspection every two years may be sufficient for newer homes. The ideal frequency depends on several factors, including the age of your plumbing system, water quality (such as hardness), and any previous plumbing issues. More frequent checks are advisable for older homes or those with a history of problems. Additionally, if your property has mature trees with extensive root systems, more frequent inspections are beneficial as roots can crack sewer and water lines. Regular maintenance helps identify potential issues early, preventing costly repairs, and can include checking for leaks, inspecting connections, and ensuring pipes and fixtures are in good working condition to prolong the life of your plumbing system.