How to fit HepVO

Since the first plumbing water trap was invented by Alexander Cumming in 1775, the system used to prevent sewer gases from entering a building has remained largely unchanged. Now Wavin has introduced HepVO – the self-sealing and waterless alternative to conventional traps.
 Conventional trap systems prevent foul odours from entering buildings by having a water seal, but this can fail due to a number of conditions including evaporation, siphonage and other mechanisms. HepVO does not rely on trapped water to create a seal – instead using a unique self-sealing membrane which will not dry out or freeze.
Watch this video to see the benefits, and how to fit HepVO

HepVO utilises a purpose designed elastomeric membrane to create an airtight seal between the living space and the drainage system, without any of the hassle or problems associated with a traditional water trap. The self-sealing valve opens under the water pressure of an appliance emptying, and closes to form a tight seal after the appliance has discharged under normal atmospheric conditions.
During the manufacturing process, the valve is securely fixed to the fitting so it cannot be accidentally removed or dislodged in a way that might affect sealing performance. In terms of flow rates, it exceeds the requirements set out by British and European Standards for 1 ¼” and 1½” traps with a 75mm seal when installed horizontally or vertically.
As only a small amount of water is required to open the membrane, HepVO is suitable for condensate drainage, condensing boilers, air conditioning units and heating interface units.
The HepVO valve promotes excellent standards of hygiene in applications where traditional traps are vulnerable to failure. The waterless valve means it can also be used safely where discharge is intermittent and a regular tap would dry out, and is particularly suitable for appliances which are infrequently used such as guest bathrooms, holiday homes, boats and mobile homes.
Made from polypropylene, HepVO has also been extensively tested with a wide range of common chemicals including both acid and alkaline products. With millions of HepVO successfully installed in homes and businesses across the UK and abroad, the user can have complete confidence that the system will work.
The HepVO installation process couldn’t be easier. The installer must first cut the pipe to length, allowing for the full compression socket depth, before removing any ‘burr’ and any sharp edges. Unscrew the cap from the adaptor, slide the cap and rubber seal onto the pipe before inserting the tube end fully into the socket. A proper seal can be achieved by hand, but the installer must ensure it is not cross-threaded, the water flow indicator is facing the right way, and if installed horizontally the ribs are on the underside of the fitting.
As well as the HepVO valves in 1¼” and 1½” sizes and the tundish adaptor kit, the range also includes knuckle bends for horizontal connections and running adaptors for connections to pipes. Also available through Wavin’s OSMA range are reducers to 21.5mm for condensate drains.