Nikon Nikonos Lens O-ring for Nikonos I, II, III, IV, V Lenses- SET OF 3 New
- Set of 3 Brand New Rings (Should be periodically replaced for best seal)
- Personally tested my own set (identical rings) for underwater use and diving on 35mm lens
- Buna N Rubber 
- Identical dimensions to original Nikonos rings (Referenced with original set)
- Make sure to use some O-ring grease for best possible seal