SPM Fizz Boom - Tap O-Ring Small (Pair) Manufacturer Part Number: 1186358 #706 SKU: 2104706002 Colour: Black Material: Rubber Small 13mm This O-Ring sits on the lower part of the tap plunger. To ensure the longevity of this part you must use food grade lubricant Haynes Lubri-Film Plus 1 x 113g(4oz) Outer Diameter: 12.83mm Inner Diameter: 7.59mm Thickness: 2.62mm