The Vigiart O-Ring Set for the HS-30 Artista Airbrush is a specialized replacement kit containing delicate seals required to maintain proper pressure and airtight seals inside the dual-action gravity-feed HS-30 airbrush. Because these seals are delicate, they must be handled with care during installation.
Keep the threads clean and free of heavy grease when installing the seals. 
If you use airbrush lubricant (like Regdab or Iwata Super Lube), use only a microscopic amount on moving parts, avoiding the air path seals directly.
Do not soak these O-rings in harsh solvents like pure acetone or lacquer thinner, as they can cause the rubber to swell, warp, or degrade prematurely.