RockShox schrader valve core fits suspension air fork, rear shock and seat posts. 2 step top caps do not include adjuster knob. Valve core used for non U-turn fixed-travel coil and air spring fork models. Also used for Reverb height adjustable seat posts. 
Fits suspension air fork, rear shock and seat posts
2 step top caps do not include adjuster knob
For non U-turn fixed-travel coil and air spring fork models
Also for Reverb height-adjustable seat posts