https://www.mccoys.com/shop/p/6933089-052303-36/imperial-gv0699-c-wall-register-boot-2-14-in-l-12-in-w-6-in-h-galvanized
GV0699-C Wall Register Boot, 2-1/4 in L, 12 in W, 6 in H, Galvanized
Sku: 6933089-052303-36
$16.47
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Used for in-line transition from round pipe or insulated flexible duct to a register or grille. 30 ga.
Finish
Galvanized
Length
2-1/4
Width
12
Height
6