External SVP`s are handy when there is no direct access into a drainage system and the gully pot traps are tight and restrictive, by making access into the soil vent pipe you have direct access into the system without the need to pass through a trap. Older systems are typically constructed from cast iron pipe work but we do occasionally come across asbestos type pipe work with modern day systems being constructed from polypropylene.Ī soil vent pipe (SVP) or soil stack pipe can be just that, a pipe to vent the system however they would normally be utilised to carry foul waste from upper floor toilets, sinks, baths and showers down to the below ground drainage system. These are the pipes that run vertically from the below ground drainage system to just above your roof gutter level, the SVP allows smells and odours from the drainage system to vent in an area that wont offend anyone and at the same time allows air into the system to prevent siphoning of water from sinks, baths and shower traps. > site map > soil vent pipes Soil Vent Pipes
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