'O' rings - 2.5, 3.5, 5, 7 & 9 mm internal Ø

'O' rings - 2.5, 3.5, 5, 7 or 9 mm internal Ø. Highly weather resistant. 10/pack.

2.5 mm Ø, for use on 4 mm Ø booms - ref. 82-003.

3.5 mm Ø, for use on 5 mm Ø booms - ref. 82-004.

5 mm Ø, for use on 8 mm Ø booms - ref. 82-006.

7 mm Ø, for use on 10, 11, 12 Ø booms - ref. 82-010.

9 mm Ø, for use on 12, 14  & 16 mm Ø booms - ref. 82-014.

An 'O' ring added to the mast head makes a simple and quick attachment method for a SAILSetc wind indicator. A band in the lower end of the wind indicator wire engages in a hole drilled in the mast. Note the bend in the wind indicator wire when used with 025-100.