* PipeSold by Cinnabar Equipment at 866-468-4267'); return false">Z-Vent 45 degree and 90 degree elbows are non-adjustable, rigid elbows.* Inner gasketed female and non-gasketed male* In many cases, a 45 degree elbow will have the value of 2.5 feet against your maximim length of pipe run. Check your manufacturers installation manual for their venting requirements.