https://www.mccoys.com/shop/p/6933568-052303-36/imperial-gv0705-c-wall-register-boot-4-in-l-12-in-w-6-in-h-galvanized
GV0705-C Wall Register Boot, 4 in L, 12 in W, 6 in H, Galvanized
Sku: 6933568-052303-36
$13.04
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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
4
Width
12
Height
6