Witten 306MGR Energy Saver Auto Foundation Vent, 8" x 16", Gray GiftsForSeason 3/8”( 10mm) and ½” (12mm)

3/8”( 10mm) and ½” (12mm)

It contains solubilized organic nutrition that is immediately available for amazingly fast recovery of stressed plants

Convenient wire cutter included

MPT connection to pressure tank

A long-wearing

Witten 306MGR Energy Saver Auto Foundation Vent, 8" x 16", Gray GiftsForSeason 3/8”( 10mm) and ½” (12mm)Highlights: Size : 8" x 16" Color : Gray Material: Thermo plastic With automatic damper 65 square inch net free area No electrical hook up required Replaces old style manual vents Fits standard 8" x 16" vent openings High density thermo plastic construction The key mechanism, bi metal coil, fully enclosed in protective cover Automatically opens at 70 degrees fahrenheit and closes at 40 (approximately) Stainless steel compression spring with 1