At least he has craftsmanship

I don't say this is right, I don't say this is wrong. I just say that as one blue-collar worker to another, I kinda understand. In this profession, you see some shit.

are they coming back, or did you just get free pipes

well not free but still

it may be some kind of signature or smth.

If your drain pipe flows up hill, you might need something like that to prevent air pockets causing backup.

i dont know what that is but i might wory. but can somone tell me what that is?

probably but I'm not a plumber lmao