Lennox Y9942 – Nu-Calgon 4165-24 Drain Solve is a professional-grade liquid drain opener formulated to clear, maintain, and prevent clogs in condensate, HVAC, and plumbing drain systems. This fast-acting solution dissolves organic buildup, sludge, soap residue, and other common obstructions to restore proper drainage and prevent overflow issues. Safe for PVC, copper, and most metal piping when used as directed, Drain Solve is widely used by HVAC technicians, facility managers, and homeowners for routine system maintenance. The convenient 1-quart bottle offers easy handling and precise application for residential and light commercial service.

Key Features:
• Genuine Lennox replacement part Y9942
• Nu-Calgon 4165-24 Drain Solve liquid drain opener
• Clears and prevents organic clogs, sludge, and scale buildup
• Ideal for HVAC condensate drains, plumbing lines, and maintenance programs
• Safe for most drain materials when used as directed
• 1-quart (32 fl oz) bottle for professional or homeowner use

Common Uses & Compatibility:
• HVAC condensate drain lines
• Residential and commercial plumbing systems
• Preventive maintenance for air conditioning and refrigeration equipment