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Hepworth HepVO valves (pronounced Hep Vee-Oh), a patented non-return valve which has been on the market since 1997. The HepVO valve system is engagingly simple to understand. There are only three components; the valve itself which looks pretty much like any other piece of pushfit plastic pipe fitting, a straight connector and a knuckle or bend, each available in two sizes (32mmm for basins, 40mm for baths). The innovation is inside the valve where a one-way membrane is stretched across the walls: this allows water and air to pass through it downstream into the waste pipes but stops foul air passing upstream into the house. They are widely available from plumber's merchants (though they sell remarkably few, it seems) at a cost of between £12 and £15 a time.
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Bought from this company I can only say excellent service thank you
Verified purchase: Yes | Condition: New