The Navien 30008630D Drain Cock is a genuine OEM replacement component designed for compatible Navien tankless water heaters and combination boiler systems. Featuring an M12 x P1.7.5 threaded connection, it provides a secure, reliable point for draining water during servicing, flushing, maintenance, or winterization. The drain cock helps technicians safely remove water from the system... https://www.partshnc.com/30008630d-navien-tankless-water-heaters-drain-cock-m12-x-p175-npn