Finally, its threaded cap allows you to back-off and air down to the perfect tire pressure with micro-adjustable precision. SANTA CRUZ Reserve Fillmore Bicycle Tubeless Valve - 50mm, Black, Pair. Compatible with Presta pump heads and most sealant injectors, Fillmore is backward-compatible with whatever you got, and forward-thinking in every way.Made for mountain, gravel and 'cross rims up to 28mm deep.