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Black flexible tee pipe fitting insulation, closed-cell foam, plenum rated

Nomaco Kflex

Nomaco Kflex 801-T-048418 4-1/8" x 1-1/4" Elastomeric Tee Pipe Fitting

SKU CH-ZYPX-Y00NV

Elastomeric tee fitting insulates 4-1/8 in tube with closed-cell Buna-N/PVC, rated -297 °F to 220 °F, R-3.1, UL 94 flame spread 25, antimicrobial and plenum rated

  • Product typeTarps
  • Closed-cell elastomeric foam resists moisture and air infiltration
  • Antimicrobial treatment inhibits mould and bacterial growth on the surface
  • Plenum-rated with UL 94 flame spread index 25 for fire safety
  • Operates continuously from -297 °F to 220 °F for extreme environments
  • R-value 3.1 per inch reduces thermal loss on 4-1/8" tube installations

Nomaco Kflex 801-T-048418 Tee Fitting

This Nomaco Kflex tee fitting insulates pipe junctions in commercial and industrial mechanical systems. It is built for installers who need a flexible, closed-cell elastomeric piece that fits a 4-1/8 inch tube outside diameter. The black Buna-N rubber and PVC blend resists microbial growth and meets plenum rating requirements. It suits projects specifying UL 94 compliance and a flame spread index of 25.

Verify Pipe Size And Temperature Range

Confirm the existing pipe carries a 3-1/2 inch nominal size so the 4-1/8 inch inside diameter seats correctly. The unslit installation style requires the fitting to slide over the tube before the joint is assembled. Ensure the service temperature stays between -297 degrees F and 220 degrees F. Check that the 1/2 inch wall thickness satisfies the insulation specification for the R-value of 3.1.

Replaces Damaged Or Missing Tee Insulation

This part replaces a torn, crushed or missing tee section on a 3-1/2 inch pipe run. The jump is worth it when the original insulation has lost its antimicrobial barrier or no longer meets the plenum rating. It also upgrades bare fittings that need a flame-retardant cover rated to UL 94. Buyers who need a straight length or a different diameter should look elsewhere.

How it compares

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Price $9.99
Cheaper than about 80% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameK-FLEX USA
Product typeTarps

Questions about this item

Does the Kflex 801-T-048418 tee fitting come unslit or do I need a separate adhesive kit?

It arrives unslit with a 1/2 in wall thickness; adhesive or tape for sealing the seam is not included and must be purchased separately.

How do I decide between the 4-1/8 in and 3-1/2 in size references for this tee?

The 4-1/8 in figure is the tube outside diameter the tee fits over; the 3-1/2 in figure is the corresponding nominal pipe size — choose the one that matches your actual tubing OD.

What does the R-value of 3.1 mean once the tee is installed on a hot-water line?

At 1/2 in wall thickness the tee provides R-3.1 thermal resistance, limiting heat loss on lines operating up to 220 °F while staying flexible down to -297 °F.

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