Osma RoundLine

Size and colour

RoundLine is a 112mm (4½") half-round domestic gutter system with circular 68mm downpipe available in black, white, brown and grey colour options.

Ease of installation

RoundLine is fitted with a ‘Flexiclip’ seal jointing mechanism, making it easy to connect gutter to fittings. Because the clip is flexed, rather than the whole component, this ensures a positive, permanently watertight joint.

Design features

1. For outstanding flow performance RoundLine features an hydrodynamic outlet to handle more rainwater than similarly sizes competitive systems.


2. Using specialist seal technology our wide, retained seals provide a secure, watertight fixture with the flexibility to allow for thermal expansion.


3. For an aesthetic pleasing finish, Wavin fittings have been engineered with concealed sockets to hide roughly cut downpipe ends.


4. Expansion line and stopper for a secure and reliable installation.

How to Videos

Visit the Osma Rainwater playlist on YouTube to play our range of videos covering subjects such as installing a guttering system, allowing for expansion, maintenance and an overview of StormLine, our premier high capacity ogee domestic rainwater system.

What’s next?

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And why not take this opportunity to have a look through our downloadable product guides, certifications and other literature.