45-degree Concentric Pipe Vent Elbow, Takagi/State/AO Smith 100266119
45° Elbow, Centrotherm-type Concentric Venting Pipe. Takagi/State/AO Smith/Reliance item number 100266119.
This gadget is part of the Direct Venting Systems for Takagi/State/AO Smith/American Heating/Reliance models 110C, 310C and 510C Gas Tankless Water Heaters. This uses the Takagi Proprietary APNC35 Concentric Vent Design which allows for an extremely long maximum venting length of 43 feet and up to 4 elbows.