Ninja OFV Fill Valve HK Skull Mask We recommend two inserts per

We recommend two inserts per headband for the best head coverage

Enhanced Grip – Machined grooves provide superior Positive-Grip and control

Extremely lightweight and responsive feel

Air is given a larger path per port to escape

Performance Red

Ninja OFV Fill Valve HK Skull Mask We recommend two inserts perNinja OFV Fill Valve MADE IN THE USA!!!! This fill valve features a O ring style seal which removes the need for any sort of thread sealing tape. The fill valve also utilizes a "shoulder" to prevent over tightening and ensure proper pocket depth when installed in the regulator body. This fill valve can be found on all new Ninja regulators marked OFV above the fill port, it is not compatible with NPT threaded systems.