The best replacement for o ring is x ring.

The best alternatives to o ring are rated as following:
★★★★★  x ring
★★★★  x ring chain
★★★  gasket
★★  fire ring
★★  non o ring chain
★★  standard chain
★  roller chain
★  non o ring
★  non oring chain
★  d ring
  d ring binder
  x ring chains
  o ring
  o'ring

Your alternative for o ring is not listed? Suggest!
Speaking about o ring, one probably shouldn't forget about bumper key.

Other search terms related to o ring and their ratings are:
★★★★★ bumper key
You have in mind a companion for o ring and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of o ring in all years. Click on graph for more.
o ring
x ring
x ring chain