Automatic Roof Vent Opener, 2-3/4 in.

Greenhouse Automatic Roof Vent Opener for Most Canopia Greenhouses | 2 H x 2.7 W x 15.7 D in | s- Multi Color

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Canopia by Palram Automatic Roof Vent Opener, 2-3/4 in. x 15-3/4 in. x 2 in.