The DiversiTech® CVENT-2 is a 2 in. concentric termination kit that simplifies installation for high efficiency furnances by only requiring one hole through the wall or roof where the pipes terminate. Without using the kit the installation would require cutting two holes through the home (one for each pipe). The kit includes combustion air inlet cap, air inlet pipe, vent pipe and intake/vent concentric Y. Diversitech Vent Kit, 2 in Vent, Import