I've probably got enough drainpipe and one 90deg drainpipe bend here.
You will need one length of flexi, one more 90deg drainpipe bend, one downpipe joiner, an in-line filter, a snorkle top / brackets and (I think) one 70mm Silicone 90deg bend.
Oh, and some jubilee clips.
I've got the correct size hole saw.