AQUANEAT Aquarium Siphon, Fish Tank Siphon, Aquarium Vacuum, Aquarium Water Changer, Gravel Cleaner for Fish Tank (Large)

Q: Can i get a replacement

You would have to contact the company who makes it, they can answer that question.

Q: What is the diameter of outlet tube? What is the diameter of the inlet tube before it flares out?

Intake tube before it flares out is about .5”; discharge tube is .5” Intake tube at very end is 1.5” but if you use filter attachment, it goes down to 1-1/8”.

Q: Does it have a screen on the end to filter what is being siphoned?

No it does not, I had a difficult time getting it to work maybe I was not doing it correctly since it was my first time using a siphon but I did not like it.