Yes, I have installed a number of them. They were invented here in Canada so the the govt body CMHC NRC has lots of test data on them and has been promoting them since the early 90s.
3" or 4" drainage copper is quite available here. Not sure why i wouldn't be there. Your plumbing supplier must have it. I'm not liking the use of aluminum tube for the water lines as it is quite reactive and not generally used for potable water.
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