The Manthorpe range of in-line tile ventilators can also be used as outlet terminals for extraction fans and soil pipe ventilation when used in conjunction with a Manthorpe GTV-AD Flexi Pipe Adaptor and one of the range of GRPA Flexible Pipes. This will convert the rectangular vent outlet to a standard 4 inch diameter pipe opening, which can be connected directly to the outlet of a soil stack or to a extractor fan.