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Travis Perkins£120.78Visit shop Wavin OsmaVent air admittance valve 82-110mm white
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Amazon£139.99Visit shop Osma OsmaVent 4S304W air admittance valve for 110mm / 82mm pipe.
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The Wavin OsmaVent is a professional-grade air admittance valve designed for plumbers and DIYers who need to manage pressure within sanitary waste systems. Its primary benefit is the efficient admission of air into discharge pipes to maintain seal integrity while reliably blocking foul odors from entering a building. While it is an extremely durable, BBA-approved fitting, users should note that proper installation is critical to ensure the valve remains accessible for future maintenance and inspection.
| Model Part Number | 4S304W |
|---|---|
| Brand | Osma |
No, the OsmaVent must be installed in a vertical position to allow the internal mechanism to function correctly.
Yes, it is highly recommended if the valve is installed in a loft or unheated space to prevent the unit from freezing.
Yes, it is a building regulation requirement that all air admittance valves remain accessible for future maintenance.
Yes, by removing the rubber seal, the valve can be adapted to fit 82mm soil pipe systems.
A visual inspection once a year is sufficient to ensure there is no dust or cobweb buildup blocking the air vents.
Check if the valve is seated correctly on the pipe or if the internal diaphragm is obstructed by dust/debris.
The valve may be stuck or blocked. Remove the unit, clean the vent paths, and ensure it is installed vertically.
To install the Wavin OsmaVent, ensure the soil pipe is cut cleanly and deburred. The unit features a push-fit design that sits directly onto 110mm soil pipes. If you are working with an 82mm system, remove the internal rubber seal to allow for the appropriate pipe diameter connection.
Care instructions are straightforward: ensure the valve is installed in an upright, vertical position to allow the internal diaphragm to function correctly by gravity. Avoid covering the valve with materials that block air intake. Periodically inspect the area for cobwebs or dust buildup that might obstruct the vents. If the valve is located in an unheated space, keep the provided polystyrene packaging in place to protect against extreme temperature drops.
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