Product review (5 stars): Fit an Alton brand 16 gallon Wet/Dry Shop vac perfectly ...
Fit an Alton brand 16 gallon Wet/Dry Shop vac perfectly!  I looked at Lowes, HOme Depot, Walmart & Ace and they all did not have a replacement drain cap-the store representative all said "drain caps all measure specific to brand"  Grateful for this generic one.  Saved us from buying a new one.