Lennox X0258 - Cerroset 406805008139, 1/4" L x 3/8" S x 50', Ductless/Mini-Split Insulated Lineset, Flare Nut, Black

 

Lennox X0258 – Cerroset 406805008139, 1/4" L x 3/8" S x 50' Insulated Lineset is a high-quality copper refrigeration lineset designed for ductless and mini-split heat pump systems. This pre-insulated, flare-nut-ready lineset ensures reliable refrigerant flow, simplified installation, and long-lasting performance in residential and light commercial applications. With a durable insulation jacket and precision-manufactured copper tubing, it helps maintain system efficiency and reduce energy loss.

This 1/4" liquid line and 3/8" suction line combination is compatible with most major mini-split brands and Lennox ductless systems. The factory-installed flare nuts allow faster, cleaner installation with fewer field materials needed. The black UV-resistant insulation provides long-term outdoor durability, while the 50-foot length supports flexible routing through a wide range of installation layouts.

This Lennox X0258 / Cerroset lineset is commonly used during equipment replacements, upgrades, or new system installations where maintaining proper refrigerant capacity and preventing condensation issues is essential. Ideal for HVAC contractors and homeowners seeking dependable, OEM-compatible refrigerant lines.

 

Key Features

• 1/4" liquid line x 3/8" suction line, 50-foot length
• Pre-insulated copper lineset for ductless and mini-split systems
• Factory-installed flare nuts for fast, secure connection
• UV-resistant black insulation for outdoor durability
• Flexible design supports long or complex routing paths
• Compatible with most Lennox and major-brand mini-split systems
• Helps maintain refrigerant integrity and energy efficiency