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 Features Quick and easy installation. Converts vent outlet onto a standard 4 inch pipe. Adaptor securely clips to the vent outlet. No need to cut battens. Connects to range of flexible pipe extensions. Suitable for mechanical extraction fans. Suitable for soil pipe ventilation. Adaptor available for 4 inch to 3 inch pipes. Designed for use with the Manthorpe Slate and Tile Vents, the GRPA Flexible Pipe range provides an economical, quick and effective connection to standard 4" soil pipes and ventilation systems.