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The brass/tungsten hammer weight is needed to open the valve when using higher reg pressure or wanting longer valve dwell time
Swapping this over from the factory valve will yield 40-50fps depending on caliber
5mm valve bore
has better feel then factory
Umarex Zelos Side Mount Plenum 17cc/35cc Zelos Plenum:35cc Side mount gauge (facing) The brass/tungsten hammer weight is17 35cc side rear mount gauge facing plenum designed for the Zelos. With this added you can expect increase of 20 40fps depending on caliber, tune, and projectile. Itll come with the necessary washer seal, shims, and orings needed for the installation. You would use your factory gauge. They are cnc machined from 6061 T6 and blk anodized. Made in USA
