Properties Width: 360mm. Height: 250mm. Description When constructing high end roof terraces or public walkways, designers and users do not want to have to contend with bad odours coming up from hidden drain pipes. Wallbarn can supply a variation on the design of the standard drain connector in EPDM which incorporates the perforated flange and spigot, but also contains a siphon mechanism to help eliminate bad smells and odours emitting from the drainpipe up to the roof or deck. As water drains off the roof it will fall into a well-type holding basin, effectively sealing the drainpipe. Only when a larger amount of water flows in will the water level rise above the internal lips and run down into the shaft and into the HDPE drainpipe. It works in a similar way to a U-bend beneath a sink unit.