Ninja OFV Fill Valve HK Skull Mask The Spent Series accessories are

The Spent Series accessories are non-firing replicas

Standard Threading – Compatible with most paintball and airsoft HPA markers

Extremely lightweight and responsive feel

Air is given a larger path per port to escape

keeping you face cool

Ninja OFV Fill Valve HK Skull Mask The Spent Series accessories areNinja 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.