Need help identifying this volume controller

[bathroomuser]

I have a dripping shower/tub that is mostly Grohe, with a thermostatic valve and a volume control that I couldn’t find any info on in the original sales list when the bathroom was renovated in 2000. This picture shows the thermostatic control and then the smaller volume control below it. Can anyone help identify it? Thanks in advance.

 

[TJRAD]

You have the 1st generation Grohe "Talia" Volume control #19875R00
the cartridge to turn your shower on and off was available in two sizes.
1/2" was the most common. Cartridge number 45882000
3/4" was also available. Cartridge number 45888000
pic below shows how the handle comes apart to access the Cartridge.
Good Luck

 

[Sponsor]

 

[bathroomuser]

You have the 1st generation Grohe "Talia" Volume control #19875R00
the cartridge to turn your shower on and off was available in two sizes.
1/2" was the most common. Cartridge number 45882000
3/4" was also available. Cartridge number 45888000
pic below shows how the handle comes apart to access the Cartridge.
Good Luck
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Thank you so much! This is extremely helpful!