An adapter for a pressurized dispensing container containing a viscous foamable solution includes a dip tube in connection with the container and arranged for conveying the viscous foamable solution towards a tip seal. A tip seal for use with the adapter includes a core part with an at least partially open proximal end and at least partially open distal end. The core part is at least partially inserted into the dip tube at the proximal end. A cap part is movably connected with the core part at the distal end of the core part between an open position and a closed position of the tip seal. The cap part comprises a closure element adapted for closing off the at least partially open distal end of the core part in the closed position of the tip seal.