At Osma we’re always looking for ways to make drainage technology more advanced.


Creating industry-leading products that perform better, last longer and are easier to install.

Above Ground Videos

Acoustic Coupler

Reducing structural borne sound in soil stacks due to thermal expansion is a big issue...

So OSMA have developed something called the Acoustic Coupler and this is how it works


HepvO. The world’s first waterless trap.

KeyWay system

When installing any drainage system the perfect angle of fall is vital.

So OSMA set to work creating a system that removes the guesswork.

Rainwater range

Available in a range of six profiles and a choice of colours for all types of domestic, commercial and industrial applications.

The OSMA Rainwater Range.

Running outlet

The advanced hydrodynamic running outlet has a unique wider aperture, capable of handling up to 30% more rainwater when compared with other outlets of a similar size.

StormLine Option

With heavier downfalls than ever before, many conventional guttering systems just can’t cope with the volume of water.

So OSMA developed StormLine.

Above Ground Range

Osma Rainwater

PVC-U gutter profiles for residential and commercial applications

Osma Rainwater Range


Soil system offering solvent weld and ring-seal connection methods

OsmaSoil Range


Push-fit waste and solvent weld waste systems for standard and high temperature usage

OsmaWaste Range

Osma Overflow, V-Joint traps and Condensate

Osma Overflow Range


Hygienic self-sealing waste valve

HepvO Range

Below Ground Videos

Bottle Gully

It's advanced design include a rotating body, which means you can position the gully at an angle that suits the drainage system.

Osma UltraRib

Osma UltraRib has been designed and manufactured to exceed all required industry standards for PVC-U systems, OSMA UltraRib has provided foul and surface water solutions that have been relied upon for over 30 years.

Below Ground Range


Below ground drainage system

OsmaDrain range

Osma UltraRib

Plastic drainage system for adoptable situations up to 300mm

Osma UltraRib range

Osma inspection chambers

The widest range of bases available for adoptable and non adoptable situations

Osma inspection chambers range

Osma domestic channel drainage

Lightweight and robust drainage soultions - plastic and galvanised grating options

Osma inspection chambers range


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