Each fixture trap shall have a liquid seal of not less than "xxx" inches and not more than "xxx" inches?

The correct answer specifies that each fixture trap should maintain a liquid seal of not less than 2 inches and not more than 4 inches. This range is established to ensure that the trap effectively retains a sufficient volume of water to prevent sewer gases and odors from entering the living spaces, which is a vital component for maintaining hygiene and safety in plumbing systems.

Having a minimum of 2 inches allows enough water in the trap to create an effective barrier against gases, while the maximum of 4 inches prevents the trap from flooding and compromising drainage performance. This balance helps ensure that the plumbing system functions properly while also adhering to industry codes and standards.

Understanding these specifications is crucial for plumbing professionals as they work to install and maintain effective drainage systems within buildings. This knowledge contributes to the overall health and functionality of plumbing infrastructures in residential and commercial settings.