Suburban Mfg Furnace Limit Switch For Nt 40. It is compatible with Suburban's NT-40 models. Includes a 90 day limited warranty. Features of Suburban Mfg 231807 Furnace Limit Switch For Nt 40 Designed for use with RV furnaces Compatible with Suburban's NT-40 models Includes one limit switch per package 90 day limited warranty Package Contents: Suburban Mfg 231807 Furnace Limit Switch For Nt 40 Suburban Mfg 231807: Furnace Limit Switch For Nt 40