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FRANK puddle flanges

The original


In the early 1980s, FRANK developed and patented the FRANK puddle flange, a sealing system in use today in millions of buildings and structures all over the world. The original.

FRANK Mauerkragen. Das Original

The FRANK puddle flanges, suitable for all standard pipes in steel, plastic, stoneware, concrete and cast iron from d 20 to d 3200, have been specifically designed for the pressure-tight installation of pipelines in concrete walls, foundation plates and manholes. FRANK puddle flanges are pressure-tight

water, diffusing media such as gases (e.g. radon) and hydrocarbons (e.g. oil, petrol). The FRANK puddle flange is an extremely flexible product available in a range of versions. A perfect solution for any application! Easy to install. Cost-effective alternative to conventional sealing systems.

FRANK Mauerkragen Schemazoom

Protection against radioactive gas

Radon-resistant, gas-tight puddle flanges from FRANK


Radon is a naturally occurring radioactive gas and comes from the natural radioactive decay of uranium and thorium. These metals occur naturally in bedrock and the release of radon therefore depends on the local geology. You cannot see, smell or taste radon. The gas diff uses through the soil and is released into the atmosphere where it is found in very small concentrations. Outside of buildings, radon is therefore not a problem. The gas can however enter buildings, for example through cracks and joints, defective foundation plates in the

basement or the ground floor, or along cable and pipe ducts. In this case, the radon concentration builds up gradually, often exceeding the limit values recommended by the German Federal Office for Radiation Protection. Tight foundations, solid constructions and special ventilation measures help keep the radon concentration in buildings low. When installing pipes and cable ducts through building walls, we therefore recommend using the special orange FRANK puddle flanges which are tested for radon-tightness.

FRANK Mauerkragen, radondicht
FRANK Mauerkragen, radondichtzoom

Pressure-tight up to 10 bar!

Safe and versatile


Externally tested and certified

The independent testing institute Materialprüfanstalt MFPA Leipzig GmbH has tested the pressure-tightness and sealing capability of FRANK puddle flanges. Depending on the diameter, FRANK puddle flanges are proven to be tight up to pressures between 8 and 10 bar.


FRANK puddle fl anges made in EPDM
EPDM is chemically resistant to a wide range of acids and bases. It also offers outstanding weather and ozone resistance. For applications in connection with oil and petrol, FRANK puddle flanges made in NBR are the preferred option.

Choosing the right pipe

FRANK products for all applications
The FRANK puddle flange can be installed on any type of pipe material, from plastic, steel and stoneware to concrete, cast iron, fibre cement or GFRP. The FRANK puddle flanges are available for all conventional outside diameters.

FRANK Mauerkragen, 10 bar - Dichtheitsprüfungzoom

Successfully installed 1.5 million times throughout the world

Examples of applications

FRANK Anwendungenzoom
FRANK Mauerkragen - Anwendungsbeispielezoom


Quick and easy


Installing a FRANK puddle flange takes only a few minutes. The puddle flange is mounted by hand on the pipe and secured with the supplied clamping bands as described in the installation instructions. A screwdriver can be used to install the clamping band on pipes of up to 315 mm in diameter. For larger pipes, use a clamping tool.

Now with Easy-Lock function


Our puddle flange installation kits ( d 20 to d 315) now come with an Easy-Lock function that allows for even faster installation on the pipe.


Product range

FRANK Mauerkragen-Setzoom
FRANK Schachtanschlussmuffezoom
FRANK Mauerkragen ab d355zoom
FRANK Wanddurchführungzoom


® 2020 FRANK GmbH | Imprint | GTC | print

Since 1965

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