Also, just a suggestion, but I did this to make 100% sure.
If you have the means (an extra pump and place to hold some water), run water through it for 12 - 24 hours.
I just wanted to make sure that anything in the pipe's or excreted by the glue was washed out before getting anywhere near my tank with it.
It's also a PAIN to prime the thing. I ended up drilling a small hole in the top of the 45 deg elbow, and attaching a valve to it, to assist with evacuating the air.
(also, you MAY want to go lower with the back part than I did with mine, or use 3/4 - 1" ID
pipe.. The flow rate is kinda low.. I'd guess about 40 - 50 GPH