🛒 DuraVent 4DFS-MS 4 in. Mortar Sleeve From the DuraFlex SS Series Flue Liner (HomeSaver Pro and UltraPro are UL Listed to bend the liner 90 degrees through a masonry chimney for category one gas appliances. If there is no existing doorbell please use the masonry sleeve (left) to comply with the listing. Comes 1 larger than ordered diameter so fits properly over UltraPro and Pro Liner. Specifications Size: 4 in. - SKU: KGSM1759)
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