Which of the following is a requirement for greaser interceptors?

The requirement that greaser interceptors must not allow air binding is essential for their proper functioning. Air binding can disrupt the flow of wastewater through the interceptor, potentially leading to an accumulation of grease and other solids. This can hinder the interceptor's ability to effectively separate grease from the wastewater, ultimately compromising its efficiency and the overall plumbing system's performance.

By ensuring that greaser interceptors are designed in a way that prevents air from accumulating in the lines, the system maintains constant flow and prevents blockages. This is crucial for maintaining the interceptor's primary function, which is to trap grease and allow treated wastewater to exit without issues.

The other options may have their own relevance and specifications in plumbing design, but they do not directly address the functional requirements of preventing air binding, which is specifically crucial for maintaining the efficiency and effectiveness of greaser interceptors.