what type of pipe do i have

In my house i replaced 3 main stacks, 2 of which were 4" galvanized, the other was cast iron. The fittings, and couplings were HUGE 4" threaded.
I had to cut those pipes, what i learned here was slow speed on the sawzall, lots of blades, and someone spraying spray lube on the blade while cutting....that last one was the magic.

I guess the 4" galvanized was not common, but my local old school plumbing house owner was familiar with it, can't remember what he called it, but he had a name for that type of DWV system.

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Its always interesting how people choose to respond.
I post a question to other professionals asking for feedback and instead of sharing advice and feedback, I receive questions and am told im speaking above my knowledge level.
My family has been in construction for 4 generations. I have been in the industry since i was 5&#;
I have built and renovated more than homes than i can count. I now inspect houses.
I of course know that galvanized and cast pipes are different-- but they both suck and fail over time.
How can you inspect them? Many times people can look around in exposed areas such as a basements and under sinks and see the start of leaks as i just did inspecting their house and included pictures for the multiple problem areas i found.
And Yes i understand to truly understand you would need to have a camera scope etc etc.
By me- that&#;s around $ and still not going to be able to check all pipes or predict failure.
So- I was asking if someone has any language that can be helpful. If i am buying a house that has cast/galvanized waste pipes- I would appreciate someone helping to educate me on what i am buying.
This forum is for us as professionals to help each other/share info/etc.
So pls share and if you have nothing&#;thats ok too&#;

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