Umarex Zelos Side Mount Plenum 17cc/35cc Zelos Plenum:35cc Side mount gauge (facing) Increase in fps will vary

Increase in fps will vary depending on the setup

It'll come with a m6 socket screw for installation

I have only test fitted this for the tactical tube version

15cc plenum made for the Notos

Umarex Zelos Side Mount Plenum 17cc/35cc Zelos Plenum:35cc Side mount gauge (facing) Increase in fps will vary17 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