20" Double Wall B Vent SKU 18GVFF Please select 20" FLASHING FOR 18" B-VENT20" DURA-VENT 45 DEG ADJ ELL20" DURA-VENT STORM COLLAR20" DURA-VENT TEE20" DURA-VENT CAP (1/BOX)20" DURA-VENT PIPE 18" LENGTH 20" DURA-VENT PIPE 18" ADJ LTH20" DURA-VENT PIPE 3' LENGTH Log in to view price