Boxes for flush mounted Boxes for pre-installation of air conditioning Siphon Ref. 23038 For evacuation and displacement of the water produced by condensation during the work of a cold or heat pump. Prevent odors. For boxes Ref. 23034 and 23039. ← Dividing guide (Ref. 23036) Box of 480 x 130 mm (Ref. 23039) →