Viton® O rings have excellent chemical resistance and can be used at temperature range of between -15°C and 180°C. Although generally more expensive than NBR (Nitrile) O-rings, FKM has found wide acceptance in the aircraft, automotive and chemical industries. 

These O-Rings are the finest available for airsoft use and fit perfectly in all standard sized AEG air nozzles with o-ring grooves. 

We recommend lubricating the O-Ring with liquid silicon oil or a thin PTFE based grease.