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You have it backwards, Hans, the pressure is the same per diameter, flow rate increases with larger pipe. As pipe diameter increases, there is proportionately less of an increase in flow, because...

Since your home is fairly new, I'd say one cleanout is for the storm drain (weeping tiles), the other for the sanitary drain. I haven't seen any house traps in recent homes in my area of Southern...

A good tv camera inspection should tell you where your pipe is and what kind it is. Around here it costs about $250 or so, but with a colour camera, you can usually differentiate pipe types....

We had a power vent heater installed after our old hot water heater kicked the bucket. It was so noisy we had the heater rental company come back and replace it with a direct vent heater - no noise...

But... on the other hand, I've had a Fernco coupling on my pool pump connection for 12 years, no problems.

I was recommending the angle grinder, not suggesting going out and buying a cut saw. They are basically the same thing, a rotating disk that cuts the pipe. Our Stihl saw is just a large version of...

If you're using an angle grinder, make sure you have room all the way around the pipe for it. I work in waterworks and we use Stihl quick cut saws all the time to cut cast iron. With underground...