【FIT MODELS】: It is compatible with Dometic Atwood Furnace DFMD Series with Serial Numbers AFTER 72489156: DFMD25111, DFMD25121, DFMD25131, DFMD25141, DFMD25151, DFMD30111, DFMD30121, DFMD30131, DFMD30141, DFMD30151, DFMD35111, DFMD35121, DFMD35131, DFMD35141, DFMD35151 Browse sail switch replacements featuring upgraded brackets and durable construction. Perfect for RV furnace maintenance and repair Designed to ensure the proper operation of your RV furnace's blower motor. Dometic™ Atwood Furnace Sail Switch 33082 With Bracket - RV Parts Atwood 33082 Sail Switch RV Furnace Sail Switch For Dometic Atwood Hydro Flame AFSAD AFSD AFMD - 31093 AFMD Series Sail Switch Kit FIT MODELS】: It is compatible with Dometic Atwood Furnace AFM Series with Serial Numbers AFTER 72489156: AFMD25111, AFMD25121, AFMD25131, AFMD25141, AFMD25151, AFMD30111, AFMD30121, AFMD30131, AFMD30141, AFMD30151, AFMD35111, AFMD35121, AFMD35131, AFMD35141, AFMD35151 A replacement medium/large sail switch kit assembly for an Dometic Atwood Hydroflame Furnace This sail switch is an important safety feature that detects air flow and verifies that the blower motor is functioning properly before allowing the furnace to ignite and begin heating the air The sail switch is an important safety feature that detects air flow and verifies that the blower motor is functioning properly before allowing the furnace to ignite and begin heating the air.