INSULPEX Pre-insulated PEX Piping


Flexible Pre-insulated PEX Piping
INSULPEX® is an ideal hydronic distribution pipe. It consists of PEXa O2 Barrier pipe surrounded by foam insulation and a durable corrugated PE outer jacket.

The smooth interior wall of the carrier pipe provides superior flow and resists mineral build-up.

INSULPEX is available in one- and two-pipe configurations from sizes 1 to 6 in. nominal. The two-pipe configuration, offered in diameters 1 to 2 1/2 in. nominal, combines supply and return pipes to streamline the installation process.

Perfect for distribution to snow and ice melting areas, INSULPEX is also an ideal pipe for:

  • District heating
  • Chilled water
  • Process piping
  • Hydronic piping
  • Potable water
  • Geothermal 
  • Outdoor wood boilers


Provides Long-term Performance
Crosslinked O2 Barrier pipe offers long-term strength. The high degree of crosslinking in REHAU crosslinked polyethylene (PEXa) pipe provides durability and flexibility with enhanced temperature and pressure capability. 

Offers Flexibility
As an alternative to rigid piping systems, INSULPEX®, REHAU’s pre-insulated PEXa piping, consists of flexible PEXa pipe surrounded by a solid layer of CFC-free polyurethane foam insulation. The pipe’s flexibility allows it to bend around obstacles, or to be directionally bored, offering ease of installation while reducing expensive labor costs.

Minimizes Energy Loss
INSULPEX pipe is specially designed for the efficient transfer of heated or chilled water through buried pipelines, offering a continuous piping system that minimizes temperature change. This equates to increased efficiency in the mechanical room and cost savings to the owner.

Streamlines Installation
Accessories such as anchors, kickers and thrust blocks that are required on rigid systems are not required when installing the REHAU INSULPEX system. This is made possible by the self-compensating properties of the ribbed pipe and the dependability of the buryable fitting. Continuous coils and the availability of a two-pipe configuration further streamline the installation process.

Signature Components

REHAU pre-insulated PEX piping insulation kits make tee, elbow and straight connections considerably easier and quicker.
F2080 Fittings
Our compression-sleeve fitting system provides reliable connections even in tough weather conditions. No heat or chemicals are required for assembly. Quick, easy connections are immediately ready for pressure testing and safe to bury. Available as couplings, tees, elbows or transitions.

FUSAPEX Fittings
Our electrofusion fitting system, made of crosslinked polyethylene (PEX), is used for fast, simple and safe connection of PEX pipes in operating temperatures up to 200°F (93.3°C). Fittings are available as couplings, tees, elbows or transitions.

Insulation Kits
Our polymer shell kits make reliable insulation of tees, elbows and straight connectors considerably easier and quicker. Kits are available with molded staggered ends or with two split halves, clamps and sealing rings.