Allen 4" hatch O Ring
Dart 18 hatch cover O Ring
4" 'O' Ring for Dart 18 manufactured by Steve using 5mm neoprene sponge rubber, being slightly thicker ensures a good seal for the Hatch Cover.
Steves tip "spray the hatch lid with silicone spray, this forms a good seal and easy access. Be careful not to get silicon on the trampoline.