Your house might be old if it takes 3 water knobs(original of course) to control your bath and shower water....... : r/Oldhouses
3-handle Shower Faucets at Lowes.com
How to Turn on a Shower That Has Three Knobs | Hunker
Pfister Part # LG01-1120 - Pfister 3- Spray 3-Handle Tub And Shower Faucet With Metal Knobs In Polished Chrome (Valve Included) - Tub & Shower Faucet Sets - Home Depot Pro
5PCs Waterfall Shower Set Bathtub Tub Shower Faucet Three Knobs w/ Handheld | eBay
Aosspy 3-Handle 1-Spray Round Shower Faucet with Combo Set Wall Mounted Shower Head System in Matte Black AS-SHAE749MB - The Home Depot