Replacement external o-rings for the gas fill port on GBB (Gas blow-back) magazines and grenade shells. Compatible for WE, KJW, KWA, HFC, Bell, Tanaka, Marushin, Maruzen, WELL, SnowWolf and others. NOTE: Will not fit Tokyo Marui magazines due to smaller diameter of fill hole.








• MSRP $5.99

• Materials: Aerospace grade silicone

• Max Pressure: 1400psi

• Max Operating Temp: 450º F

• Min Operating Temp: -65º F

• Package Includes: 6 x O-rings