Stainless steel inner and galvanized outer pipe.
Diameter Sizes: 5", 6", 7" & 8"
Part Identification: Letter UT and GT
Clearances: 2" of airspace to Combustibles
Temperature Ratings: 2100°F (Maximum Test 10 min.) 1400°F (Maximum for 60 min.) 1000°F (Maximum Continuous Operating Temperatures)