SPECIAL ORDER ITEM. Review Returns Policy before purchase. Designed for adjustable roof applications, this gas vent roof flashing is suitable for type B gas vent installations. It features a size of 4 in with a lower height of 5-3/8 in and an overall height of 7-9/16 in. The adjustable pitch ranges from 6/12 to 12/12, providing flexibility in installation. The cone base size measures 7-3/8 in, with an overall base size of 18-1/2 in length by 17-1/8 in width. This flashing is effective in preventing water infiltration around the gas vent system, making it an essential component for any appropriate venting solution.