This is a bottle adapter machined for the Umarex Zelos. It’ll come with washer seal, shims and orings needed for installation. You would use your existing gauge (m8) from the factory air tube you’re replacing this with. They are cnc machined from 6061 T6 and blk anodized. Made in USA
Note- Threads are M18x1.5
New batch is in production. Will be available 02/14/25