3/8" x 1-1/8" x 6' Rubber Pipe Insulation Cover

K-Flex 6RX038118 – 1-1/8" ID x 3/8" Wall Elastomeric Pipe Insulation, 6' Length

The K-Flex 6RX038118 is a flexible, closed-cell elastomeric pipe insulation designed to limit thermal transfer and control condensation in commercial and residential piping systems. With an inner diameter of 1-1/8", a wall thickness of 3/8", and a length of 6 feet, this insulation is well-suited for use on copper or iron piping in HVAC, refrigeration, and plumbing applications.

This product is formulated with low thermal conductivity and moisture permeability to enhance system efficiency and prevent surface condensation. It complies with ASTM E 84 25/50 flame and smoke rating standards and is appropriate for indoor mechanical system insulation.

Product Features

• Closed-Cell Elastomeric Construction – Provides consistent thermal resistance while helping prevent moisture vapor intrusion.
• ASTM E 84 25/50 Rated – Meets building code requirements for flame spread and smoke development.
• Flexible and Lightweight – Simplifies installation on long pipe runs, elbows, and fittings.
• Moisture-Resistant Design – Minimizes the risk of condensation and corrosion on piping surfaces.
• Manufactured in the USA – Meets domestic standards for mechanical insulation applications.

Technical Specifications

• Inner Diameter: 1-1/8 inch
• Wall Thickness: 3/8 inch
• Length: 6 feet
• Material: Flexible elastomeric rubber
• Flame/Smoke Rating: ASTM E 84 25/50

Installation Overview

Install over clean, dry piping. The insulation can be field-trimmed with a utility knife and sealed using contact adhesive or compatible tape. For optimal performance, ensure all seams and terminations are fully sealed to preserve the vapor barrier and thermal integrity. Additional mechanical fastening may be applied as needed to meet job-specific or code requirements.

Application Considerations

This product is suitable for both new installations and retrofits on chilled water, hot water, and refrigeration lines. It is widely used in mechanical rooms, utility chases, and above-ceiling spaces where thermal efficiency and condensation control are critical.