Vulcanised fibre seals for 12/17, 15/21 and 20/27 terminals. Applications: for water (max. temperature 80 °C) and mechanical tightening. Available in pack of 100. Dimensions:. 12 / 17: int. Ø 9 mm, ext. Ø 14.5 mm. 15 / 21: int. Ø 12 mm, ext. Ø 18 mm. 20 /