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.

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 up to 10 bar, preventing the ingress of pressurised 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.

Mauerkragen Schema

FRANK puddle flanges: Protection against radioactive gas

Radon-resistant, gas-tight puddle flanges from FRANK

Slow decay of Uranium and Thorium, regionally abundant in different concentrations in the rock and soil, leads to the emergence of the invisible, smellless and tasteless radioactive noble gas radon. The noble gas radon is hardly reactiv. The gas escapes through the upper layers of the soil into the atomsphere and is quickly diluted in the air, so that outside from buildings no health risk has been identified. But if the gas does invade into the building through joints, cracks, leaky base plate into the cellar or first floor, leakages along cables and pipes it leads to increased concentration of radon which could result in excceding the recommended limits of Federal Office for Radiation Protection. Tight foundations, massive building structures, and air ventilating measures help reduce the radon concentrations in buildings.
Both the standard black puddle flange (EPDM) as well as the orange version (NBR), that one also resistent and proof towards hydrocarbon compounds, e .g. oil, gasoline, were successfully tested to be radon-proof.

Mauerkragen Skizze
Mauerkragen radondicht

Pressure-tight up to 10 bar!

Safe and versatile

Externally tested

The independent Material Testing Institute Leipzig tested the FRANK puddle flange for its sealing effect then confirming the FRANK puddle flange when professionally installed, embedded in and surrounded by at least 50 mm watertight-concrete – depending on diameter and design – a complete sealing effect at water pressures of 5 bar to 10 bar.

Characteristics FRANK puddle flanges made in EPDM

The EPDM material used is resistant to a great number of acids, alkalines and resistant to weathering and ozone. The FRANK puddle flange made of NBR is used for e. g. oil and gasoline as hazardous media.

Mauerkragen Dichtheitsprüfung

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.

Mauerkragen auf verschiedenen Rohren

Successfully installed 1.5 million times throughout the world

Examples of applications - FRANK puddle flange

Anwendung Mauerkragen
Anwendungen Mauerkragen

Puddle flange installation

Easy and fast

Installation in just a few steps

  • put the FRANK puddle flange onto pipe
  • fix the puddle flange on the pipe with the clamping band
  • position the pipe with puddle flange to the intended position in the wall or floor slab
  • grout with waterproof concrete

FRANK puddle flange with Easy-Lock-Function


The FRANK puddle flange set (d 20 to d 500) is supplied with the new Easy-Lock function. With this technology, the puddle flange can be clamped multiple faster onto the pipe.

Mauerkragen Easy-Lock-Funktion

FRANK puddle flange - delivery program

d 20 - d 500 mm

Mauerkragen Set

> d 560 mm

Mauerkragen ab d 560mm

FRANK manhole connection SAM type 1

FRANK Schachtanschlussmuffe

FRANK Wanddurchführung mit Flanschanschluss und Mauerkragen für Blitzschutz

FRANK Wanddurchführung mit Flanschanschluss und Mauerkragen für Blitzschutz

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