According to specifications, pipe and fittings must not contain more than what percentage of lead?

The correct answer is based on the standards set by the Safe Drinking Water Act, which requires that the lead content in pipes and fittings used for drinking water meet stringent limits. Specifically, the law dictates that plumbing materials, including pipes, must not contain more than 0.25% lead when calculated as a weighted average of the entire product, and for solder and flux, the limit is 0.2%.

However, within the listed options, the percentage of lead allowed in pipe and fittings mentioned in choice D exceeds the legal limitations set for safe drinking water applications. It is essential to understand that in any context regarding lead content in plumbing materials, keeping lead levels as low as possible is critical, as lead poses significant health risks, especially to children and pregnant women.

A more accurate understanding of acceptable lead levels in accordance with federal regulations would suggest that the presented options may not include the current industry standards, highlighting the importance of ensuring that any usage of materials complies with those critical safety requirements.