Have a 2-3 day old spathe of a Cryptocoryne with a reasonable tube length (5+ cm)
Cut off the lower part of the kettle (not the side as in the picture left) and remove the spadix with both the female
and male flowers (see drawing at right)
Take care of letting the valve intact
Take the kettle between your lips at the position of the valve
DO NOT touch the edge because it may irritate your lips
Press air (to escape between the valve and the kettle wall). Gently push the valve
in an optimal position with your lips