The plumber came out today to fix a drain. It drained but not as well as it should. The problem is clearly in the drain "stopper" that stops the water or releases it from the lavatory basin. Technician first said I had too high a water pressure. Tested it and it read in the 90's pounds. Tech. said he could install a pressure reduction valve for almost $500. and that would be good for all my appliances.
Said he would roto root the drain from the wall and fix the drain. All areas from the PTrap were fine because I'd cleaned them myself. Anyway he'd "fix" them for about $200..
I sent him on his way after he'd charged me $40.+ for the service call.
Yes, 80 pounds of pressure is the normal maximum for water pressure and yes, some appliances warn against more than 80 lbs. but all mine work well according to the manufacturers literature up to 110lbs.
He left without doing a thing except try to sell me 1. A pressure reduction valve, 2. More drain cleaning than was needed, 3. A new water treatment (soft water) system (Halo) even though what I have is not yet a year old.
Nothing done except to lighten my pock book of over $40.