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CO2 injector

A fellow APDer came over this weekend (Dave G.  Not Gomberg, the other Dave)
to help set up my new CO2 system.  He had the coolest idea for a CO2
injector.  He got a little barbed elbow (Home Depot) and took a knife to
carve a small hole in the rigid plastic behind the strainer on the intake of
my Eheim.  The barbs keep both the CO2 line and connection to filter intake
where they should be.  It won't slide out or get dislodged by being bumped
plus it forces the gas through the canister.  Never thought of doing it
quite like that.