6″ x 3″ LDVI is better for noise reduction: See here.
CALL FOR DEEP DISCOUNTS ON FERNCO BRAND STOCK FOR THIS ITEM
6″ x 3″ Black Flexible Reducer.
6″ x 4″ coupling with reducer insert for 4″ side.*
*FERNCO couplers are a straight 6×3 with no reducer needed. ON SALE WHILE SUPPLIES LAST
MADE IN THE USA
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