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 flexible elastomeric tee pipe fitting with closed-cell foam structure

K-Flex Usa

K-Flex Usa 801-T-048318 Elastomeric Tee Pipe Fitting

SKU CH-WMFA-W5N9M

Elastomeric tee pipe fitting with antimicrobial, fire-retardant closed-cell foam rated for -297 to 220 °F and R-value 3.1

  • Operates from -297 °F to 220 °F for extreme-temperature piping
  • Closed-cell Buna-N/PVC foam gives R-3.1 thermal resistance
  • Plenum-rated with flame-spread index 25 meets fire codes
  • Antimicrobial and flame-retardant formulation protects air quality
  • Flexible unslit tee fits 3-1/8 in tube OD for quick installation

K-Flex USA 801-T-048318 Elastomeric Tee

This elastomeric tee pipe fitting is designed for insulating pipe junctions in plumbing and HVAC systems. It suits installers needing a flexible, closed-cell foam component that conforms to complex piping layouts. The unslit design requires fitting over pipe ends during assembly or retrofit work.

Thermals Noise and Power Draw

The insulation operates continuously from minus 297 degrees Fahrenheit up to 220 degrees Fahrenheit. Its closed-cell Buna-N rubber and PVC structure provides an R-value of 3.1 to limit heat transfer and control condensation. Antimicrobial and flame-retardant properties meet a flame spread index of 25 for plenum-rated safety.

Upgrade Path and Fit

This tee replaces rigid or lower-temperature insulation at three-way pipe connections where flexibility and wide thermal range are required. The jump is worth it when existing materials cannot handle sub-zero conditions or plenum fire codes. It is not for systems needing pre-slit wrap-around installation without pipe disassembly.

Highlights

  • Operates from -297 °F to 220 °F for extreme-temperature piping
  • Closed-cell Buna-N/PVC foam gives R-3.1 thermal resistance
  • Plenum-rated with flame-spread index 25 meets fire codes
  • Antimicrobial and flame-retardant formulation protects air quality
  • Flexible unslit tee fits 3-1/8 in tube OD for quick installation

Specifications

BrandK-FLEX USA

Questions about this item

How do I install the unslit tee fitting onto a 3 1/8 in pipe, and what step is commonly missed?

Slide the unslit tee over the pipe before joining the branch line, then seal all seams with compatible adhesive tape; the step often missed is taping the inner junction where the three legs meet.

Will the Buna-N rubber/PVC insulation need replacement due to UV exposure or antimicrobial degradation?

The closed-cell foam resists microbial growth and is rated for -297 to 220 °F; it requires no scheduled replacement unless physical damage or prolonged direct sunlight degrades the surface.

At what temperature does the flame-spread rating of 25 cease to protect the plenum installation?

The material maintains its 25 flame-spread index and plenum rating up to the maximum operating temperature of 220 °F; beyond that the rating no longer applies.

Also in this aisle

People compared these

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