NO-RUST CAPS are solvent-proof plastic. They don't utilize any gaskets, which means less deterioration and less parts for fewer hassles.
FAST-BLAST CAPS utilize a one-piece paint passage tube, making the cap
leak-proof. Their all-plastic, no-gasket construction eliminates the possibility
of rust and solvent damage. The unique friction-fit joint securely holds the
bottle to the airbrush.