This product is a Robertshaw 41-401 Hot Surface Ignitor model 767A-369, designed for use in HVAC and refrigeration systems. It is known for its reliability and efficiency in igniting the gas burners.
Good price-Had one go bad 5 years ago-replaced and back in service for $18 back then in 10 minutes. It failed in coldest part of winter last week-lost my spare--Cost $340 for repairman to run one out. Bought this one as a spare for next time---PLAN AHEAD