ProPEX® Lead-free Brass Fitting Adapters transition PEX tubing to copper fittings. These adapters are approved for use in hot and cold domestic potable water systems and for use in hydronic radiant heating systems. One end of the adapter is manufactured with the Uponor ProPEX® Fitting for connections to Wirsbo hePEX™ tubing or Uponor AquaPEX® tubing. These adapters are safe for direct burial in soil.