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Black flexible 90-degree elbow pipe fitting, closed-cell foam, unslit, antimicrobial finish

K-Flex Usa

K-Flex Usa 801-LRE-068448 90° elbow pipe fitting 4-1/2" x 1-27/64

SKU CH-FXZZ-Y8AM0

Elastomeric 90° elbow fitting insulates 4-1/2" tube with 3/4" wall, rated -297°F to 220°F, R-4.6, plenum rated, antimicrobial and flame spread 25

  • 90-degree elbow redirects pipe runs in tight spaces
  • Buna-N rubber/PVC blend withstands -297 °F to 220 °F
  • Closed-cell foam delivers R-4.6 thermal resistance
  • Antimicrobial, flame-retardant formulation meets 25 flame-spread index
  • Plenum-rated flexible insulation fits 4-1/2 in tube OD

K-Flex USA 90° Elbow Fitting

This K-Flex USA elastomeric pipe fitting is a 90-degree elbow designed for 4-inch pipe with a 4-1/2 inch tube outside diameter. It suits mechanical insulation jobs that require a pre-formed bend rather than field-fabricated mitres. The unslit Buna-N rubber/PVC construction arrives ready to install on chilled-water, refrigerant or hot-water lines. Plumbers and HVAC contractors gain a consistent wall profile without cutting straight insulation on site.

3/4 inch wall with R-4.6 thermal resistance

The 3/4 inch wall thickness delivers an R-value of 4.6 across a temperature range from -297 °F to 220 °F. Closed-cell foam structure limits moisture vapour drive and maintains insulating performance on below-ambient systems. Antimicrobial and flame-retardant additives meet a 25 flame spread index and plenum rating for air-handling spaces. The material remains flexible for tight-radius routing but cannot compensate for pipe sizes outside the stated 4-inch nominal diameter.

Replaces field-cut straight insulation on 4-inch

Use this elbow when labour savings and verified fire ratings outweigh the cost of pre-formed fittings. It upgrades installations that previously relied on mitred straight sections taped at corners. The jump is worth it on projects requiring plenum-rated antimicrobial insulation with documented R-value consistency. Builders needing larger diameters, different wall thicknesses or unslit straight lengths must source separate parts.

Highlights

  • 90-degree elbow redirects pipe runs in tight spaces
  • Buna-N rubber/PVC blend withstands -297 °F to 220 °F
  • Closed-cell foam delivers R-4.6 thermal resistance
  • Antimicrobial, flame-retardant formulation meets 25 flame-spread index
  • Plenum-rated flexible insulation fits 4-1/2 in tube OD

Specifications

BrandK-FLEX USA

Questions about this item

Will the 4-1/2" inside diameter fit over my existing 4" nominal pipe without gaps?

Yes, the fitting is made for a 4" pipe size and its 4-1/2" inside diameter matches the tube outside diameter for a snug fit over standard 4" pipe.

How can I confirm the 90° elbow is seated correctly after installation?

Check that the unslit insulation fully covers the joint, the black Buna-N/PVC surface is continuous, and the elbow sits flush against the straight runs with no visible gaps.

Does the package include adhesive or tape for sealing the unslit seam, or must I buy that separately?

The fitting ships as a single unslit elastomeric elbow; any compatible adhesive, tape or mechanical fastener for sealing the seam is purchased separately.

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