bathroom shower drain

Replace shower drain flange from top. Which products before I try to hire someone who has done this? Tx I have a few pictures of my shower drain which is part of an entire plastic shower enclosure. tempit - Google Drive The metal drain cover came off years ago and I epoxied it on a few...

I am not very DIY experienced but felt capable of cleaning the mildew off our shower drain cover. There was nothing adhering the cover other than some old looking putty or caulk and the cover already felt loose on the shower tray. I removed it and it seemed a bit different underneath than what I...

Situation: Existing bathroom with no room to vent shower. Code for my area is IPC. PDFs and the jpgs are the same. Whichever work for you. Your thoughts on this drain line layout. Any issues with the WC drain entering the stack above the 2" drain? TIA

So why are they no longer around? I know the knee jerk answer most likely has to do with venting of fixtures and drain clogs ... but really? They were in place for years with little problem. Probably no more then any other type of bathroom drain line. Any "Old Timers" have a perspective on this...