GRHose. Hose Grommets Grommet secures hoses inside the Hookah Converter to keep them from falling out and killing your vibe. Silicone (White) or Rubber (Black) 0.46" (12mm) or 0.57" (14mm) Diameter. Price: $0.20 Unit: EACH Size: 0.46" (12mm) SMALL0.57 (Add $0.15) Material: Silicone (White) (Add $0.25)Rubber (Black) Quantity: