Uploaded July 2019 | Updated September 2026, 12 hours ago

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

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

It uses ‘Right First Time’ technolog… and it’s called the OSMA KeyWay System.

Every KeyWay fitting has a unique notch. And the corresponding Boss has a locating key.

When lined up, these lock together…to guarantee the perfect angle of fall… every time.

So why leave it to chance?

Install the unique OSMA KeyWay system

OSMA. The science of drainage.

wavin.com/en-gb/osma-above-ground