This reminds me when we were doing automatic class in elite and my instructor Mr. Ortiz when he said "Shift valve" it sounded like he was saying "Shit valve" because of his Puerto Rican accent
I couldnt stop laughing to save my life. The Shit valve controls the Shit quality, the Harder the valve spring the Firmer the Shit. If your Shit is too firm you need to run a softer Shit spring.