In the end, everything is a gag.
- Charlie Chaplin (1889-1977)
You got to be careful if you don't know where you're going, because you might not get there.
- Yogi Berra

“Duties” explained.
No matter the item’s physical size, its wall thickness (and therefore its weight!) will increase as we progress up the scale of Light – Medium – Heavy – Extra Heavy – and, Severe Heavy Duties.
The main issue to remember is that a specific duty, say Heavy Duty, is a different wall thickness on smaller items than on larger items. The wall thicknesses on every item and every duty are published to ease your decision.
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