Compatible with Rinnai Condensing Tankless Water Heaters: (RU199i, RU180i, RU160i, RU130i, RUR199i, RUR160i, CU199i, CU160i)
Material of Inner/Exhaust -Polypropylene (PPtl)
Nice professional look to installation
Vent components consist of an outer vent for air intake (4 in.) and an inner vent for the exhaust gases (2 in.)