This vinyl double containment piping system is fast and easy to install, and is available with a complete selection of pipe, fittings, and valves. Double-See® is available in PVC and CPVC; either material may be primary or secondary (PVC x PVC, CPVC x PVC, CPVC x CPVC) with Clear PVC always being an option for the containment pipe. Installation versatility allows simultaneous joining throughout a system or in combination with patented closure couplings which enable practical compliance with the ASME B31.3  requirement for visual inspection of all primary joint connections during the pressure test before closing the secondary piping joint.


Size Range:

  • ½"- 6" inner pipe
  • 2" - 10" outer pipe

Pressure Rating:

  • Varies by Size (primary)
  • PN4 (50 PSI) (secondary)

Operating Temperature:

  • Varies by pipe


  • Polyvinyl Chloride (PVC) Grey
  • Chlorinated Polyvinyl Chloride (CPVC)
  • Clear Polyvinyl Chloride (Clear PVC)
Simple installation

The installation versatility of Double-See allows for simultaneous jointing throughout a system or in combination with patented closure couplings. These enable practical compliance with ASME B31.3 Code requirements.

Large standard selection

A large selection of standard components is available. Additionally the Double-See™ system is also available with custom designed spools and leak detection options.

Compensated for thermal expansion

An innovative centering design compensates for thermal expansion. This allows Double-See to be used in both aboveground and underground installations.

Assured quality

Double-See pipes and fittings are 100% factory-assembled. They offer GF quality as well as field and factory engineering support.


Georg Fischer LLC

9271 Jeronimo Road

92618 Irvine

United States

GF logo on the headquarters building