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Technical Knowledge · Piping Materials

Push-fit systems · GF iFIT

GF iFIT: the push-fit system for building installation

iFIT is the push-fit system from GF: cut the pipe to length, chamfer and calibrate, push the adapter on, push the module on until it clicks – done, without a press tool and without a flame. It joins polybutylene and multilayer composite pipe from d16 to d32 and is approved for drinking water, heating and cooling up to 70 °C and 10 bar (manufacturer information). This page shows how the system is built and what it can do – and leads to five step-by-step guides for typical projects.

Pipe
Polybutylene pipe (PB) · multilayer composite pipe PE-RT II/Al/PE-RT II
Dimensions
d16–d32
Joint
Push-fit: adapter with grip ring and two O-rings, module clicks in audibly
Tools
Pipe shears and chamfering/calibrating tool – no power, no machine
Limits
10 bar / 70 °C continuous operation, 50 years (PN 10, manufacturer information)
Availability
from stock, also individually packed

How the system is built

iFIT consists of three parts. The pipe: polybutylene pipe in coils (also in conduit) or multilayer composite pipe in straight lengths and coils – both belong to the system and are approved together with it. The adapter: it is pushed onto the prepared pipe end and carries the whole joining technology – the grip ring that holds the pipe against pull, two factory-fitted O-rings that seal, and the inspection window that shows the insertion depth. The module made of PPSU – elbow, tee, reducer, transition with thread, manifold or tap connection – clicks audibly onto the adapter; threaded parts are made of brass or lead-free gunmetal.

The modular adapter technique is the special feature: one module covers two dimensions – one for d16 and d20, one for d25 and d32. The adapter alone determines the dimension. According to GF that halves the number of parts to keep in stock and keeps the parts list clear.

iFIT distribution on site: modules and polybutylene pipes before the screed
iFIT on site: distribution with modules and pipes before the screed is laid. Image: GF

Approval and durability

GF states 10 bar at 70 °C and 50 years of continuous operation for iFIT (PN 10); the system is approved to DVGW W 534 / W 542 for pipe and module together – which is why only system pipes belong in the adapter. SVGW load values are available for the polybutylene pipe. According to GF the joint is detachable: the adapter is destroyed and replaced in the process, the module is reusable – how that works is in the installation guide.

Five projects, step by step

For the most common projects we have written a guide each – with the answer in the first paragraph, the steps, the parts list and the limits:

Project

Additional water connection

I want to connect an additional tap – how does that work with a push-fit system?

Project

Extend or relocate a pipe

Washing machine, dishwasher or outdoor tap: how do I extend or relocate a pipe?

Project

Connect a radiator

How do I connect a radiator with a push-fit system?

Project

Garden water line

Can I lay a garden water line with a push-fit system?

Project

Repair in an existing installation

A leak: how do I replace a section with a push-fit system?

For everything else: parts-list tool – choose the project, enter the dimensions, get a finished parts list with an enquiry button.

Dimensions and availability

GF iFIT: dimensions and availability at Zickwolff
DimensionOutside ø (mm)DNAvailability
d 161612in stock
d 202015in stock
d 252520in stock
d 323225in stock

The standard names dimensions. What is listed here we stock – from stock or to order; what is available how quickly we clarify on enquiry. The full range with all module types, pipes and tools: parts and tools.

The system on video

GF presents the iFIT system in two minutes – the video loads only after a click.

iFIT System – GF Piping Systems – English · Video: GF Piping Systems (YouTube). The video loads only after your click – your browser then connects to YouTube (Google).

The three basic pages

Manufacturer documents

The GF documents are decisive for operating limits and installation. You can download them here – each entry states its edition.

Supply from Zickwolff

We keep iFIT in stock – modules, pipe and tools, also individually packed, collection and dispatch. Tell us your project or send the parts list – we put everything together.

Further reading

How a push-fit joint works · Methods compared · Transitions to other systems · for planners and fitters: the technical page GF iFIT in the press systems section.

iFIT from stock

Tell us dimension and quantity – we supply iFIT modules, pipe and tools from stock, also individually packed.

Send an inquiry

Your inquiry to Zickwolff

Send us what you have – designation, standard, quantity, date. We will clarify the rest with you.

One item or a question

Send inquiry

Not in stock? We procure it – single items too.

Designation, standard and quantity are enough.

Several items

Send bill of materials

200 items? One parts list is enough – we deliver complete.

Attach it as a file.

Helpful if already known: project and country, date needed, certificates, packaging and language of the packing lists. If anything is missing, we will ask.

It is urgent

Request express

When do you need it? Express delivery, to the site if required.

Tell us by when you need the material – we will tell you what is possible.
← Back to the push-fit systems overview

Technical basis: GF practice guide for installation and repair instructions (08/2026), GF iFIT installation instructions 762 100 469 (09/2020), GF iFIT brochure gfps-39052 (12/2023), GF iFIT product range (07/2025), SVGW load values PB – authorised-dealer material, use approved; DVGW W 534, W 542. Availability according to Zickwolff stock management. Information without guarantee – the binding approval remains with the manufacturer.