Lennox 18D51 – Boss 37608, 376 Hi-Temp HVAC/R Silicone Sealant, Red, 8 Ounce Pressurized Can

 

This Lennox 18D51 high-temperature silicone sealant is manufactured by Boss as model 37608. Designed specifically for HVAC/R applications, this red 376 Hi-Temp silicone creates a durable, flexible, and long-lasting seal in areas exposed to high heat and thermal cycling. It adheres to metal, fiberglass, plastics, and most construction materials, making it a reliable solution for furnace service, flue pipe connections, high-heat sealing points, and general mechanical repairs. Its pressurized 8-ounce can ensures consistent material flow and easy application in the field.

Engineered for performance, Boss 376 maintains its seal in demanding HVAC environments, resisting cracking, shrinking, and vibration. It is commonly used by technicians for sealing furnace cabinets, venting joints, combustion compartments, and high-temperature gasketing needs where traditional sealants may fail. This Lennox-approved sealant helps maintain proper system operation by preventing air leaks, moisture intrusion, and heat loss.

 

Technical Specifications

• Manufacturer: Boss
• Model: 37608
• Type: 376 Hi-Temp HVAC/R Silicone Sealant
• Color: Red
• Temperature Resistance: High-temperature formulation for HVAC/R applications
• Size: 8 ounce pressurized can
• Applications: Furnaces, flue pipes, combustion compartments, HVAC mechanical joints, metal surfaces, and general high-heat sealing
• Compatibility: Adheres to metal, fiberglass, plastics, and most construction materials
• Features: Flexible, durable, vibration-resistant, long-lasting seal, easy dispensing pressurized can