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-048348 Elastomeric Tee Pipe Fitting

SKU CH-SPZ9-26QFX

Elastomeric tee pipe fitting insulates 3-1/2 inch tubing with closed-cell Buna-N rubber/PVC rated for -297 to 220°F, R-3.3, plenum-rated and antimicrobial with UL 94 flame spread index 25

  • Operates down to -297 °F for extreme cold systems
  • Withstands 220 °F maximum temperature for hot lines
  • R-value 3.3 insulation reduces thermal loss
  • Flame spread index 25 meets plenum fire codes
  • UL 94 rated material resists ignition

3-1/2" Elastomeric Tee Fitting

This K-Flex USA elastomeric tee fitting insulates pipe intersections in plumbing and HVAC systems. The closed-cell Buna-N rubber and PVC blend suits commercial and industrial pipework requiring thermal protection at junctions. It fits a 3 inch pipe size with a 3-1/2 inch tube outside diameter. Installers working on chilled-water, refrigerant or dual-temperature lines will find the unslit form straightforward to wrap and seal on site.

Thermal range and fire rating

The material operates continuously from -297 degrees F to 220 degrees F, covering deep-freeze to high-temperature heating circuits. An R-value of 3.3 provides consistent thermal resistance across the tee body. The product carries a flame spread index of 25 and meets UL 94 requirements, earning a plenum rating for use in air-handling spaces. Antimicrobial and flame-retardant additives resist mould growth and support fire safety compliance.

Upgrade from unslit tape or rigid sleeves

This pre-formed tee replaces field-fabricated insulation wraps and rigid pre-moulded sections that require cutting and fitting at branch points. The jump is worth it when installation speed, consistent wall thickness and plenum-rated fire performance are specified. It does not suit installations needing a slit or self-seal closure, nor pipe sizes other than the stated 3 inch nominal bore.

Highlights

  • Operates down to -297 °F for extreme cold systems
  • Withstands 220 °F maximum temperature for hot lines
  • R-value 3.3 insulation reduces thermal loss
  • Flame spread index 25 meets plenum fire codes
  • UL 94 rated material resists ignition

Specifications

BrandK-FLEX USA

Questions about this item

How do I install the 3-1/2 in unslit tee fitting on a 3 in pipe, and what step is often missed?

Slide the fitting over the pipe before joining the branch; the unslit design means it cannot wrap around an already-connected joint, so it must be positioned first.

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

The closed-cell foam resists moisture absorption and the material includes antimicrobial and flame-retardant properties, so no routine replacement is required under normal indoor conditions.

At what temperature does the insulation start to degrade during continuous hot-water service?

The maximum continuous operating temperature is 220 °F; sustained use above this limit will accelerate material breakdown.

Also in this aisle

People compared these

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