3"Iron Pipe Size (3-1/4"OD) x 72" x 1/2" Wall ID) Self-Seal Tubular Foam Insulation, Foam Cover

K-Flex 7PXL048348 – 3-1/2" OD x 1/2" Wall Self-Seal Pipe Insulation, 6' Length

The K-Flex 7PXL048348 is a flexible, closed-cell polyolefin pipe insulation designed for piping systems requiring thermal efficiency and condensation control. Featuring a 1/2" wall thickness and a 3-1/2" outer diameter, this 6-foot insulation section includes a factory-applied, self-sealing adhesive seam to simplify installation and improve system integrity in commercial and residential applications.

This product is suitable for hot and cold water piping and is engineered to operate within a wide temperature range—from cryogenic applications to hot water lines—making it a versatile solution for mechanical systems exposed to demanding thermal conditions.

Product Features

• Self-Seal Closure – Pre-slit with factory-applied adhesive for rapid installation and secure sealing.
• Closed-Cell Polyolefin Foam – Provides consistent R-2 thermal resistance and resists moisture intrusion.
• Wide Operating Temperature – Rated for -330°F to 210°F, suitable for a variety of service environments.
• Lightweight and Flexible – Adapts to irregular surfaces and piping configurations without compromising insulation performance.
• Domestic Manufacturing – Produced in the USA, meeting relevant performance and quality standards.

Technical Specifications

• Nominal Pipe Size: 3-1/2 inch
• Wall Thickness: 1/2 inch
• Length: 6 feet
• Material: Polyolefin foam, closed-cell structure
• Service Temperature: -330°F to 210°F
• Thermal Resistance (R-Value): 2
• Warranty: Limited
• Origin: Domestic

Installation Guidelines

To install, ensure pipe surfaces are clean and dry. Wrap the insulation around the pipe with the pre-slit seam aligned, then press the adhesive edges together to form a continuous seal. Use a utility knife to cut to length if necessary. In areas requiring code compliance or exposed installations, additional vapor barrier tape or mechanical fastening may be applied.

Application Considerations

This insulation is suited for both hot and chilled water piping in commercial buildings, hydronic systems, and utility rooms where consistent temperature control and moisture prevention are essential. Its self-sealing feature improves installation speed and helps maintain a continuous vapor barrier, making it an effective solution for new and retrofit systems.