Fibre Washer Seal Kit. Vulcanised fibre seal kit containing three sizes of connector seal for 12/17, 15/21 and 20/27 splice terminals. Kit content details: 12 / 17: int. Ø 9 mm, ext. Ø 14.5 mm 15 / 21: int. Ø 12 mm, ext. Ø 18 mm 20 / 27: int. Ø 16 mm, ext. Ø 24 mm Applications: for water (max. temperature 80 °C) and mechanical tightening.