Compatible with PEX, copper, CPVC, PE-RT and SDR-9 HDPE pipe in any combination; No special tools, crimping, glue or soldering required; Can be installed in wet lines; Approved for underground and behind-the-wall applications with no access panels (wrapping required when burying underground); Large diameter fittings (1-1/4 in. - 2 in.) require a Stiffener (sold separately) when connecting to PEX pipe; Can be rotated after assembly for easier and faster installation; Remove using a Disconnect Clip or Disconnect Tongs (both sold separately); Rated for 200 psi and 200 deg F (93 deg C); 25-year warranty.