Economy Electronic 3/8" BSP Hybrid Auto Drain (timer + liquid sensor) 230vac AD950T230This drain has a fixed interval, but the built in condensate sensor automatically adjusts the open time according to the amount of moisture thats accumulated. This minimises the volume of air thats lost during operation, but simplifies the installation because the drain can never get air locked. For convenience, it can also be installed in various orientations. Suitable for up to 2000cfm (60m3 min) AD 950 T Intelligent Timed Drainage 3 8" BSP & 3 8"