I have a 180 and don't want to drill it. It came with an HOB dual drain overflow (not sure what brand). But I want to buy something new that I KNOW won't break the siphon. Does anyone have any experience with modding the U-tubes to prevent siphon breaking? Or know of a good brand that REALLY won't break siphon? I was looking at the CPR cs102 possibly, but don't see any reviews about it. Any help is much appreciated.