Maybe this will help: Fox 34 StepCast 2022
"The 2022 Fox 34 StepCast get's a new and slightly more tuneable air spring. For years it was all about adding volume to the negative air chamber in order to improve a forks initial stroke suppleness, but for the 34 SC, with the racer in mind, the ability to volume-reduce the negative chamber with a clip-on style spacer, that allows users to customize the degree of support off the top, which may favor those looking for a slightly firmer platform in that initial stage of the travel. This will sit on the silver section on the lower seal-head of the air spring."
"The 2022 Fox 34 StepCast get's a new and slightly more tuneable air spring. For years it was all about adding volume to the negative air chamber in order to improve a forks initial stroke suppleness, but for the 34 SC, with the racer in mind, the ability to volume-reduce the negative chamber with a clip-on style spacer, that allows users to customize the degree of support off the top, which may favor those looking for a slightly firmer platform in that initial stage of the travel. This will sit on the silver section on the lower seal-head of the air spring."
