this post was submitted on 22 Nov 2023
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Also, they exist in different sizes, measure yours to be sure.
It's likely 2"x3" or 3"x4".
"A" elbows are bent with their wide side horizontal.
Whereas B" elbows are bent with their tall side vertical.
Both types are available in different angles: 30, 45, 75, 90.
Get a few short self-tapping metal screws to hold everything in place.