I had the same problem in my tub. After making the desision to chande th tub/shower valve I found stainless flex lines supplying the valve. The supply line had a rubber inner core shielded by the stainless steel. The rubber was disintegrate cusing the black smearing marks on my tub. Be sure to...
This tub valve imported through Homwerks. They no longer offer this model.This is the current trim. Sold through Home Depot and others.
https://www.homewerks.com/catalog/bath-products/bath-faucets?f%5B0%5D=brand%3A39&page=1
Current Cartridge
Your faucet came with the old style ceramic cartridge. The factory OEM cartridge is GP77005-RP clockwise close. The attachment shows both old and new version. They are shown bottom left. This page is from the Barry Walter Sr. Co.
Price Pfister
Trim Parts (Updated handle)
https://pfisterstorage.blob.core.windows.net/documents/pf_pe_808-m0b.pdf
Cartridge
https://www.pfisterfaucets.com/parts-support/replacement-parts/product/cartridge-9740420-cartridge-for-0x8-jx8-vb8-jv8-deep-casting-valve
The wall hydrant looks to be Woodford model 8
https://www.woodfordmfg.com/Woodford/Obsolete%20Products/Woodford%20Obsolete%20Products.html
Cleanout cover looks like Wade 8000-12 ductile top. Diameter is 5 1/2" I can't tell the height (Thickness)...
These can be frustrating to say the least. Look at Fernco FTS-4 seal. It adhears to the china bowl and the rubber fins seals to the inside of the carrier nipple. Much easier than making a seal with the 2 flat surfaces.
The sleeve does screw off counter clockwise. Use a rubber strap wrench positioned as close to the wall as possible and turn to remove. Price Pfister has changed the design of your cartridge. It now has a black plastic front that is extremely difficult to work with. I would use a generic...