Rubber o-ring replacements for all syringe barrel adapter assemblies. Standard EPR rubber for most materials. Viton rubber for use with very aggressive liquids, adhesives and solvents. Please note that Viton has changed from brown to black. Syringe air adapters in sizes 3cc, 5cc, 10cc and 30/ 55cc. Easy attachment to top of adapter head. Supplied in sealed packs of 10 o-rings. Also bulk available on request. Also for use with our SyringeGuns as well as other adapter assemblies.