Umarex Zelos HP Brass Valve

Custom brass valve designed for high airflow/high power. Swapping this over from the factory valve will yield 40-50fps depending on caliber, tune, and projectile. On my personal .25cal w/700mm barrel it is making 73ft lb using this valve along with porting the action/barrel. These are cnc machined from brass rod 360 grade and made right here in USA. 

Specs-

7.5mm valve bore

4x 7mm ports

8.5mm poppet w/stainless valve stem

Lighter valve return spring

Note-

When installing, it is best to remove the factory hammer spring adjuster or back it out so the hammer does not push the valve pin back into the valve housing. You would only need to do this prior to filling it. Once there is pressure inside the action the valve will remain closed