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1/8 bsp pressure gauge that is 25mm OD
You will use your existing reg gauge that is 25mm or smaller diameter for the installation
Once there is pressure inside the action the valve will remain closed
They will not work without it
They are cnc machined from 6061/brass 360 right here in USA
Umarex Zelos Hammer Weight Hammer Weight:Brass 7gram 1/8 bsp pressure gauge thatCustom hammer weight machined for the Zelos. The brass tungsten hammer weight is needed to open the valve when using higher reg pressure or wanting longer valve dwell time. Increase in fps will vary depending on the setup. Ive seen up to 15fps with the brass and up to 30fps increase with the tungsten on my personal setup. Other mods like porting and larger valve will assist as well You will use your existing factory hammer spring and replace the
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