check valves (one way valves)?

[keenfish]

you normaly see these for air pumps but can you get them for canisters or do self priming (pump priming) canisters have them built in?

 

[TWEDM1]

The last canister I had a fluval 404 had a built in check valve but I've never actually known of a hose sized check valve.

Just pull the hose out the water till your done or bend the hose into a u shape and aim it back into the tank close the cover on it to hold it there untill your done doing whatever your doing

 

[keenfish]

i need it to hold the pressure of an open bottom tank

 

[adadkins1]

If you are wanting to hold the pressure of an open bottom tank, I don't think a check valve would do that. Sounds more like some PVC work to me.