Specialist Power Tube with Orchid Wax (for a higher opening temperature) to fit the Mk 7 Standard, Mk 7 Triple Spring and Mk 7 Hydraulicheck Autovents.
Length excluding piston : 7.38″ / 18.75 cms.
The Orchid tube is an alternative to the standard tube for specialist applications where a higher opening temperature is required.
The standard tube enables the window to be set to start opening between around 13oC (55oF) and 18o C (65oF).
The Mk 7 Orchid Wax tube can be set to start opening the window at between 75oF and 90oF.