Carbon Dioxide flask dealies

[S. Findley]

Is there a company selling FLASK-type contraptions to knock flies out with
CO2? I would like one with a convenient yet secure receptacle for
collecting flies. (Or a recommendation for a reliable homemade design)
 

Thanks,
Seth
-- 
Seth D. Findley               polliwog at u.washington.edu
Department of Biochemistry    Phone: 206-543-1710
Health Sciences Building J579
University of Washington, Box 357350, Seattle, WA 98195