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Black NBR/PVC 90-degree elbow pipe insulation, 1-inch wall thickness, curved cylindrical form with smooth matte finish

Nomaco Kflex

Nomaco Kflex 90° Elbow Pipe Fitting Insulation 1" Thick NBR/PVC Black

SKU CH-YYBK-AAV9D

90° NBR/PVC elbow insulation, 1 in thick, R 5.90, -297 to 220 °F, fits 4 1/8 in tube

  • Product typeTarps
  • Insulates extreme cold down to -297 °F with NBR/PVC foam
  • Withstands heat up to 220 °F for hot piping systems
  • Delivers R-value 5.90 thermal resistance in 1 in wall
  • Pre-formed 90° elbow fits 4 1/8 in tube ID precisely
  • Black NBR/PVC resists moisture and UV on ducts and tanks

90° Elbow Pipe Fitting Insulation

This Nomaco Kflex elbow fitting insulation is built for 90-degree pipe bends in commercial and industrial systems. It uses a 1-inch thick NBR/PVC body that fits a 4 1/8-inch tube I.D. and a 3 1/2-inch pipe size. The black insulation operates from -297°F to 220°F with an approximate R-value of 5.90.

Suited for cryogenic and high-temperature piping

Installers working on ducts, tanks, or piping that sees extreme cold or heat will find the temperature range and R-value appropriate. It is not intended for straight-run insulation, non-standard bend angles, or applications requiring a different wall thickness or material composition.

Handles 4 1/8-inch I.D. elbows with 5.9 R-value

The fitting covers a nominal 4-inch tube I.D. at the elbow with a length of 1 27/64 inches and width of 6 1/8 inches. Thermal performance holds across the stated range, but the fixed 1-inch wall and single elbow geometry limit use to compatible bend profiles only.

How it compares

Measured against everything we stock in General Hardware & Accessories, at today’s prices. Recalculated every night.

Price $14.99
Cheaper than about 60% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameK-FLEX USA
Product typeTarps

Questions about this item

What pipe diameter must I already have for the 4 1/8 in nominal I.D. elbow to fit?

The fitting is made for 4 in tube I.D. and 3 1/2 in pipe size, so your existing pipe must match one of those diameters.

Will the NBR/PVC material stay flexible next to older rubber-insulated lines that see -297 °F to 220 °F?

Yes, the same -297 °F to 220 °F rating means it will not stiffen or degrade differently from comparable aged rubber insulation in that range.

How can I confirm the 5.9 R-value is performing after I install the 90° elbow?

Measure the surface temperature on the black NBR/PVC jacket; it should stay close to ambient when the line carries fluid at design temperature.

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