We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Black cylindrical pipe insulation foam, unslit, 6 ft length

Nomaco Kflex

Nomaco Kflex 6RX048418 trap

SKU CH-98B0-MF2YX MPN 6RX048418

Fits 3-1/2 inch pipe with 1/2 inch wall NBR/PVC elastomeric insulation operating from -297 to 220 degrees F and R-value 2.8

  • TypeDrain Components
  • MaterialHAWA
  • ColorBlack
  • Handles extreme cold with -297 °F rating
  • Withstands high heat up to 220 °F
  • Delivers R-value 2.8 for thermal efficiency
  • NBR/PVC elastomeric material resists moisture and wear
  • Fits 3-1/2 in pipe and 4-1/8 in tube sizes

Pipe insulation for 3-1/2 in pipe

This 6 ft length of NBR/PVC elastomeric insulation fits 3-1/2 in pipe and 4-1/8 in tube. The unslit design has a 1/2 in wall and a nominal inside diameter of 4-1/8 in. It operates from -297 to 220 degrees F with an approximate R value of 2.8. The black finish suits plumbing and HVAC runs.

Suited for standard pipe runs.

Installers insulating straight lengths of 3-1/2 in pipe or 4-1/8 in tube will find this length convenient. Buyers who require a pre-slit tube for quick wrap-around installation should look at alternative styles. The unslit body also means it is not intended for retrofit over existing fittings without cutting.

1/2 in wall thickness gives R 2.8

The single figure that decides fit and thermal performance is the 1/2 in wall thickness, which yields an approximate R value of 2.8. This determines whether the insulation meets the project’s heat-loss or condensation-control requirements.

Highlights

  • Handles extreme cold with -297 °F rating
  • Withstands high heat up to 220 °F
  • Delivers R-value 2.8 for thermal efficiency
  • NBR/PVC elastomeric material resists moisture and wear
  • Fits 3-1/2 in pipe and 4-1/8 in tube sizes

Specifications

TypeDrain Components
MaterialHAWA
ColorBlack
BrandNomaco Kflex
Model6RX048418

Questions about this item

How do I install the 6 ft unslit pipe insulation on a 3-1/2" pipe, and what step is often missed?

Slip the 1/2" wall insulation over the pipe before final connections, then seal the seam with compatible adhesive tape; the step often missed is taping the joint to prevent condensation ingress.

What maintenance or replacement will the NBR/PVC elastomeric insulation need over time?

Inspect annually for UV damage, compression, or tears; replace any sections that have lost flexibility or show surface cracking to maintain the R-value of 2.8.

At what temperature limit does the insulation performance degrade first under sustained use?

Continuous exposure near the upper limit of 220 °F will accelerate ageing of the NBR/PVC material before the lower limit of -297 °F becomes a concern.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.