What is the recommended connection method for 5-inch couplings?

• A. One-third twist until audible click and lugs align
• B. Full twist until threads engage
• C. Half twist until alignment
• D. Quarter twist until click

Answer: (A)

The key idea is how quick-connect, non-threaded large-diameter hose couplings lock securely. With 5-inch hoses that use Storz-style lugs, you don’t twist until threads engage—you rotate just enough to seat the lugs and lock the connection. About one-third of a full turn is the standard amount, and you should continue until you hear an audible click and see the lugs align. The click confirms the locking mechanism has engaged and the gasket is seated, giving a leak-tight, secure connection.

Turning more than that isn’t necessary and can risk misalignment or over-rotation, while turning less might not fully lock the connection, potentially causing leaks or the connection to come apart under pressure. In the field, this quick audible/feel cue is used to ensure a fast, reliable connection.