I've never seen this old valve before. Someone mentioned that Kohler parts will work for it.
An older model brass Kohler valve that stopped functioning properly. (see photo) On the Kohler support website, it is called the "Early Pressure Balancing Valve (No Specific Model Number)" and has these identifying characteristics: -All brass mixer cap and valve body. -Mixer cap has 2 screws that secure it to the valve body. -The brass, round, splined stem rotates clockwise to turn on. -Sometimes referred to as "old 304" valve was able to fix this on my own without the need of a plumber. I followed a video on YouTube called "DIY - Fixing a shower faucet that only provides hot water (Kohler faucet)"One helpful bit of advice, shove a curved paper plate underneath the old valve you intend to remove. Water will come out as you remove it, but it will cascade down the plate instead of inside your tub wall. Use a bucket to catch the dripping for easy cleanup. "From a review"


An older model brass Kohler valve that stopped functioning properly. (see photo) On the Kohler support website, it is called the "Early Pressure Balancing Valve (No Specific Model Number)" and has these identifying characteristics: -All brass mixer cap and valve body. -Mixer cap has 2 screws that secure it to the valve body. -The brass, round, splined stem rotates clockwise to turn on. -Sometimes referred to as "old 304" valve was able to fix this on my own without the need of a plumber. I followed a video on YouTube called "DIY - Fixing a shower faucet that only provides hot water (Kohler faucet)"One helpful bit of advice, shove a curved paper plate underneath the old valve you intend to remove. Water will come out as you remove it, but it will cascade down the plate instead of inside your tub wall. Use a bucket to catch the dripping for easy cleanup. "From a review"



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