Look for bolt holes/formed rail/corner clips: likely TDC/TDF/Ductmate style.
Look for slip/S-cleat and drive-cleat edges: likely S-and-drive.
Check whether gasket is part of the joint.
Use Photo ID to compare.
Ask before mixing connector parts or sealing the wrong joint type.
Ask foreman
Is this joint S-and-drive or TDC/Ductmate? I want to use the right connector/hardware before I assemble it.
Do not
Do not call every rectangular duct end the same thing or mix connector parts because they look close.
Why it matters
Using the wrong connector name leads to wrong hardware, wrong gasket/seal method, and bad field questions.
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