Double-See is available in PVC and CPVC; either material may be primary or secondary (PVCxPVC, CPVCxPVC, PVCxCPVC, CPVCxCPVC) with Clear PVC always being an option for the containment pipe. System size options range from ½” × 2” to 8” × 12” meeting virtually any media flow requirements.

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.

Transmitters and Controllers

GF SmartPro transmitters and Multi-Parameter controller are available for your process applications: The 9900 is a single-channel transmitter available as a panel or field mount, whilst the 9950 two-channel controller supports two sensors of same or different types in one instrument.

Plastic Pipes

Sturdy and lightweight, plastic pipes are ideal for use in a wide range of applications. Versatile yet durable, these all-rounders offer exceptional reliability and proven quality.

Bends & Elbows

Bends and elbows are essential fittings that easily change the direction of pipes. The extensive range available offers not only multiple materials but also different curvature degrees to easily fit your piping system.

Couplers & Sockets

Simplify the pipe installation process with couplers and sockets. Specially designed to slide easily over pipes with no extra equipment required, they are cemented, welded or mechanically connected to create a pressure-tight joint.

Tees, Y-Pieces and Crosses

When creating branch lines, lightweight tee, wye, and cross fittings make installation much easier. These fittings are made from a range of materials and malleable iron and cover multiple dimension possibilities including various reductions on the same fitting.

Pipe Outlets & Boxes

With GF Piping Systems boxes, pipes can be replaced easily without damaging the wall thanks to the flexible box feet.

Termination Fittings

Termination fittings represent the beginning and the end of a double containment system and seal the monitoring room. For complex isometrics, end fittings are used to segment the monitoring room.

Ball Valve 546 Pro

The new generation with standard lockable lever, data matrix code and modular design guarantees long-term sustainability. The Ball Valve 546 Pro meets every challenge and application, including simple water applications or complicated processes in the chemical industry, microelectronics or food and beverage industry.

Clamping and Installation Tools

Designed for stress-free installation with minimal movement during the welding and cooling process, these tools can be clamped into position with ease. The GF Piping Systems range includes multiple innovative variants for maximum practicality.


Phil Schmidt

Product Manager