Z Vent III Stainless Steel Thimble for 3" Pipe

Stainless Steel Wall Thimble Expands to 7" for use with 2 x 4 or 2 x 6 construction Z-Vent is a factory built, engineered AL29-4C special gas vent pipe, suitable for positive or negative pressure. Z-Vent is UL tested and listed to UL1738/S636. CAT II, III, IV venting approved.