These are excellent replacement orings for your C02 or Compressed Air tank. Always keep a bunch of these around or you'll be begging everyone in the staging area for a spare.
Screws in any Standard 4500psi Tank, Plated aluminum piston that produces an industry leading recharge rate and virtually eliminates reg shoot down, Non wrist digging, low profile design fill valve, All black tactical look, Meets all DOT, CGA and ASTM specifications, 4500psi