Rigiflex flexible yet rigid patented duct is electric and gas clothes dryer manufacturer recommended. Rigiflex duct is suitable for all electric and gas clothes dryer installations and is UL certified. Rigiflex duct requires no elbows as it can form tight 90 degree turns. Electric and gas clothes dryer manufacturer recommended Rigid yet flexible semi-rigid dryer duct Suitable for all electric and gas clothes dryer installations UL certified 2158A clothes dryer transition duct Color/Finish Family: Silver Manufacturer Color/Finish: silver Series Name: Rigiflex Type: Semi-rigid Width (Inches): 4 Warranty: 1-year limited CA Residents: Prop 65 Warning(s): No UNSPSC: 52141600