My Eheim 2213 canister outtake nob broke-off, what glue do I use for the plastic?.

I suggest you use a plastic welder to glue the plastic together... you can also try acetone but that probably won't be as strong and you have to apply small amounts to keep it soft for a while

regular krazy glue is fish safe. I used to "fix" my cheap impellor cover.

you could also try using silicone over the krazy glue, i don't think crazy glue alone will keep it from leaking.

THose parts are expensive.After the glue settles you could wrap some ductape around.

I'm glad you posted back with your solution and that it works. Can you tell us what specific part you purchased so others may utilize a quick fix?

just write eheim an email requesting a replacement part.

If you have a choice in your area, I've discovered while setting up my new fish room, Lowes has a much better selection of fittings and parts in their plumbing department. I've got five Home Depots within 15 minutes of my house and had to visit all five to find half of the Lasco (barbed and threaded plastic) fittings that I needed to hook up my breeder tank sumps. I finally went to Lowes, 'cuz I didn't feel like waiting for an on-line order, and found everything that I needed. One of the Dept. Managers at the orange Borg told me that they were discontinuing those fittings and a bunch of other stuff to try and concentrate on just the higher volume selling products.

This may not hold true all over the country, but I'm pretty sure that their buyers make decissions based on regional preferences, so it's probably good for most of the country. The other good thing was that the prices were a lot better. 1" barbed elbows w/ 1" FIP (female iron pipe) thread ends were less than a dollar a piece. Their vinyl hose and PVC valves were also cheaper, and they had almost twice the selection of specialty fittings, reducers, hangers and adapters.