Hatsan Invader Improved Fill Port Cover (Dust Cover)

The thin plastic port cover for my Hatsan Invader PCP was so loose it actually fell off. I created this replacement which grips the "O" rings nicely and is easy to turn but also stays put. The split in the ring is so you can just slide it on from the end of the pressure tube and it clicks right in place. I printed it in ASA with support (for the holes).