Beaver Heavy Duty Latex Neck Seal - Standard Size and Small Size Heavy duty flexible latex neck seal. Fit using Beaver Aquabond, McNett Black Witch Neoprene Adhesive or Scubapro Black Glue Solvent Free Neoprene Adhesive to ensure a high level of adhesion, necessary for such highly important components. Sizing: Standard Size - neck diameter 89mm / 3.50in, suit fixing diameter 254mm / 10in. Small Size - neck diameter 80mm / 3.15in, suit fixing diameter 254mm / 10in .