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The Lennox 75X76 is the correct replacement lamp socket for the following air purification systems:
The Lennox 75X76 Air Filtration System UV Lamp Socket is a replacement UV lamp socket for the Lennox PureAir Air Purification System models PCO-12C and PCO-20C. The UV lamp socket is an essential component of your air purification system and helps it to capture and destroy household odors and chemical vapors, while also not generating any lung-irritating ozone.
Lennox 75X76 Air Filtration System UV Lamp Socket specifications: