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Black cylindrical foam pipe insulation roll with smooth matte finish

Nomaco Kflex

Nomaco Kflex 6RX100418 trap

SKU CH-96A6-0STHM MPN 6RX100418

NBR/PVC elastomeric pipe insulation fits 3-1/2 in. pipe and 4-1/8 in. tube, 1 in. wall, 6 ft. length, -297 to 220 °F range, R-value 5.4

  • Product typeDrain Components
  • Main materialHAWA
  • Product colorBlack
  • NBR/PVC elastomeric material resists moisture and condensation
  • Wide temperature range from -297 °F to 220 °F suits extreme environments
  • R-value 5.4 provides effective thermal insulation performance
  • One-inch wall thickness enhances energy efficiency on piping
  • Black finish offers clean appearance for visible installations

Elastomeric pipe insulation for 3-1/2" pipe

This Nomaco Kflex 6RX100418 insulation suits 3-1/2 inch pipe and 4-1/8 inch tube with a 1 inch wall thickness. The six-foot length uses NBR/PVC based elastomeric foam rated from -297 to 220 degrees Fahrenheit. It arrives unslit in black for professional mechanical installations.

Fit and temperature limits

Installers working on refrigerant lines, chilled water or heating pipe up to 220 degrees Fahrenheit will find the R-value 5.4 suitable. The unslit tube requires manual slitting, so buyers wanting a pre-slit product should look elsewhere. Anyone needing fire-rated or outdoor UV-resistant jacketing must select a different specification.

Nominal inside diameter 4-1/8 inch

The single figure that decides fit is the 4-1/8 inch nominal inside diameter matching the tube size. If the pipe or tube outer diameter differs, the insulation will not seal correctly and thermal performance drops.

How it compares

Measured against everything we stock in Drain Stoppers, Strainers & Traps, at today’s prices. Recalculated every night.

Price $39.99
Pricier than about 56% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameNomaco Kflex
Model name6RX100418
Product typeDrain Components
Product colorBlack
Size & build
Main materialHAWA

Questions about this item

What size pipe does the 6RX100418 insulation fit?

It fits a 3-1/2 inch pipe and a 4-1/8 inch tube with a 1 inch wall thickness.

Will the Nomaco Kflex material handle the heat from my existing hot water lines?

The NBR/PVC elastomeric foam operates from -297 Degrees F to 220 Degrees F, covering standard hot water temperatures.

How can I verify the insulation is performing correctly after installation?

Check that the unslit tube fully covers the pipe, the black NBR/PVC foam shows no gaps, and surface temperatures match the expected R-5.4 rating.

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