3/8" ID x 1/4" Copper Tube Size x 72" x 3/8" Wall Rubber Insulation Cover

K-Flex 6RX038038 – 1/4" ID x 3/8" Wall Rubber Pipe Insulation, 6-Foot Length

The K-Flex 6RX038038 is a flexible elastomeric thermal insulation product designed for 1/4" nominal copper tubing with a 3/8" wall thickness and 3/8" outer diameter. This closed-cell rubber insulation is ideal for minimizing thermal loss and controlling condensation in plumbing and HVAC systems. Supplied in 6-foot lengths, it meets the performance requirements for commercial, industrial, and residential applications.

Formulated for long-term durability, the material resists moisture ingress without the need for a separate vapor barrier. It is rated for use across a wide temperature range and includes built-in antimicrobial protection. This product is UL-listed and compliant with ASTM E 84 for fire safety.

Product Features

• Closed-Cell Elastomeric Foam – Offers consistent thermal resistance and moisture control.
• 3/8" Wall Thickness – Meets energy code recommendations for pipe insulation in mechanical systems.
• Low VOC Composition – Suitable for indoor installations requiring clean air compliance.
• Temperature Range – Rated from -297°F to 220°F for broad application versatility.
• Microban® Antimicrobial Protection – Helps inhibit microbial growth on the insulation surface.

Technical Details

• Nominal Pipe Size: 1/4 inch
• Outside Diameter: 3/8 inch
• Wall Thickness: 3/8 inch
• Length: 6 feet
• R-Value: 2.8
• Material: Flexible closed-cell elastomeric rubber
• Compliance: ASTM E 84 25/50 rated, UL Listed

Installation Considerations

For optimal performance, install over clean and dry piping. Seams and joints should be sealed using manufacturer-recommended adhesive or tape. A utility knife and measuring tape are recommended for accurate fitting. Product can be field-cut to length as needed. While installation is straightforward, contractor-grade methods help maintain vapor barrier integrity and code compliance.

Application Scope

Appropriate for use in chilled water, hot water, refrigeration, and process piping systems in both commercial and residential buildings. Ideal for interior pipe runs where thermal retention and condensation control are critical.