Fitment:Compatible with Furnace for AFM Series with serial numbers before 72489156:for AFMD25111,AFMD25121,AFMD25131,AFMD25141,AFMD25151,AFMD30111,AFMD30121,AFMD30131,AFMD30141,AFMD30151,AFMD35111,AFMD35121,AFMD35131,AFMD35141,AFMD35151; Furnace for AFLA Series with serial numbers before 81689155:for AFLA35211,AFLA35221,AFLA35231,AFLA40211,AFLA40221,AFLA40231; Furnace for AFLD Series with serial numbers before 72991127:for AFLD35111,AFLD35121,AFLD35131,AFLD40111,AFLD40121,AFLD40131; Furnace for DFMD Series with serial numbers before 72489156:for DFMD25111,DFMD25121,DFMD25131,DFMD25141 and DFMD25151. Upgrade Bracket:To prevent switch damage, brackets can wear out and cause delayed response.Our upgraded bracket provides a lasting fix-avoiding replacement costs. Function:The RV furnace sail switch air flow sail switch is used to detect the airflow inside the stove.Insufficient airflow may cause incomplete combustion and safety hazards,which helps to solve the problem of low airflow in RV camping stove.This switch ensures that the stove only starts when there is sufficient airflow,thereby ensuring efficiency and safety in use. Color: Black Material: Plastic+Metal Package Contents: 1 x sail switch 1 x bracket replacement Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.