The Lennox 21G52 / Cerroset 612205060009 Black Shield insulated lineset is designed for reliable performance in residential and light commercial air conditioning and heat pump systems. This 50-foot lineset combines a 3/8 inch liquid line and 3/4 inch suction line with a 1/2 inch wall insulation for excellent thermal protection and condensation control. The rugged black outer jacket helps protect the lineset during installation and operation, supporting long service life and consistent system efficiency.

 

Features:

• 3/8" liquid line x 3/4" suction line for common HVAC applications
• 1/2" wall insulation helps reduce heat gain and sweating
• Durable Black Shield jacket for added protection and UV resistance
• Plain-end copper tubing allows custom trimming and brazing on site
• Suitable for air conditioners and heat pumps in residential or light commercial systems
• 50-foot length provides installation flexibility for indoor–outdoor equipment runs

 

Technical specifications:

• Brand: Lennox
• Manufacturer: Cerroset
• Catalog number: 21G52
• Manufacturer model/part number: 612205060009
• Product type: Insulated refrigeration lineset
• Liquid line OD: 3/8 inch
• Suction line OD: 3/4 inch
• Insulation wall thickness: 1/2 inch (nominal)
• Length: 50 feet
• End type: Plain end (unflared, unthreaded)
• Jacket color: Black
• Application: Air conditioning and heat pump refrigerant line runs