[sean84]

Recently bought my first RO system  

What I want to do is connect my waste pipe off the RO to the plastic waste pipe off the sink in the downstairs toilet. I think its inch and a half waste pipe, is there such thing available?

[luke g]

I think you have answered you own question,

Yes there is such thing  if you type reverse osmosis saddle clamp in to ebay you wil see what you are looking for 

[sean84]

Thanks