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
Green flexible foam tube insulation with smooth unfaced finish

Nomaco Kflex

Nomaco Kflex 6RHFN068400 Drain Trap

SKU CH-QR8Q-EGPJ6 MPN 6RHFN068400

Halogen-free elastomeric pipe insulation tube rated for -297 °F to 250 °F with R-3.2 thermal resistance and plenum-rated fire performance

  • TypeDrain Components
  • ColorGreen
  • Halogen-free elastomeric material for safer installations
  • Closed-cell foam structure delivers R-value 3.2 thermal resistance
  • Plenum-rated with flame spread 137 and smoke developed 162
  • Flexible unslit tube fits 3-1/2 in pipe with 3/4 in wall
  • Operates from -297 °F to 250 °F for extreme conditions

Pipe insulation for copper tube size 4 1/8 in

This Nomaco Kflex tube suits 3-1/2 in pipe with a 4 in inside diameter and 3/4 in wall. Closed-cell Buna-N rubber gives an R value of 3.2 across a 6 ft length. The material is halogen-free, flexible and rated for plenum spaces. It arrives unslit in a green finish.

Replaces worn or missing wrap on hot and cold lines

Upgrade when existing cover is cracked, water-logged or no longer meets a flame spread index of 137 and smoke developed index of 162. The jump is worth it if the system runs between -297 °F and 250 °F and needs continuous thermal performance without gaps.

Verify the pipe outer diameter matches 3-1/2

Confirm the run can accept an unslit tube that must slide on from an end. Check that local code accepts the listed fire indices and that the operating range covers the coldest and hottest fluid temperatures in the circuit.

Highlights

  • Halogen-free elastomeric material for safer installations
  • Closed-cell foam structure delivers R-value 3.2 thermal resistance
  • Plenum-rated with flame spread 137 and smoke developed 162
  • Flexible unslit tube fits 3-1/2 in pipe with 3/4 in wall
  • Operates from -297 °F to 250 °F for extreme conditions

Specifications

TypeDrain Components
ColorGreen
BrandNomaco Kflex
Model6RHFN068400

Questions about this item

What pipe size and wall thickness does the 6RHFN068400 tube fit?

The tube is sized for a 3-1/2 in pipe with a 3/4 in wall thickness.

How is the unslit insulation installed, and what step is often missed?

Slide the tube over the pipe before making connections, then seal the lengthwise seam with compatible tape or adhesive.

Will the Buna-N rubber insulation degrade or need replacement under normal use?

The closed-cell elastomer resists moisture and operates from -297 °F to 250 °F, so it does not require scheduled replacement.

Also in this aisle

People compared these

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