Apprentice question
Verify first
Verify before you commit. Cheap to catch now.
If the collar engagement is too short to hold, do not trust the joint. Replace the fitting or add an approved coupling/detail with proper overlap.
['A spiral joint needs enough overlap to fasten and seal. If the pipe only catches a tiny bite of collar, vibration and pressure can walk it apart.', 'Check insertion depth, collar condition, pipe cut, and fitting type. Recovery is usually a proper long-collar fitting, approved sleeve/coupling, or replacement fitting before final seal.']